G'day mates i see you want to be a h.o.o.v.y
First we need to know what is a hoovy
Hoovies are a friendly creature found in Team Fortress 2 that is a subclass of the Heavy Weapons Guy. They are usually seen crouching with either their secondary or melee out. In order to be a Hoovy, a Heavy must use an edible item as its secondary. It's best to leave these peaceful creatures alone because they can be deadly in the wrong hands.

Hoovies are the most common friendly and can be found almost anywhere. If you are nice to one, they may give you a snack! Hoovies are also:
Hungry
Obnoxious
Omnivore
Vigirously
Yelling

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First you need to know the big hoovys weapons you should use Gear :
Primary: Not important, but usually the Tomislav because of the quick spin up time. They never use their primary unless attacked.
Secondary: The icon of the Hoovy as always been the Sandvich, but the Second Banana has lately become popular among Hoovies due to the faster charge time allowing them to have a food item on them without needing to steal a health pack. Young Hoovies can also use the Dalohko's Bar or the Buffalo Steak Sandvich.
Melee: Usually the Holiday Punch, but pretty much any melee weapon works.

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These weapons are universaly known as the best way to hoovy these weopons are the least threaghtful and in an time needed you can pull out your minigun. Now you need to get the look. Use these Cosmetics
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The most common cosmetics include the Chicken Kiev, Tough Guys Toque, and the All-Father. If the cosmetics are painted they will most likely be Pink As Hell, especially the All-Father. Many Hoovies also wear Pyro-Vision Goggles, along with many other friendlies.
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Behavior
In order to be a hoovie you must act like one.

Actions:
To be a Hoovy you don't have to do much. Just crouch down with a melee out and you are good to go. Hoovies using the Holiday Punch will likely try to hit you from the back, most will also go for the taunt kill. Some Hoovies may instead give a sandvich after a Holiday Punch hit if they fear that they have injured the other player.A common thing for Hoovies in groups to do is have a picnic. They form a loose circle and throw their Sandviches into the center.

Hoovies may also use sprays to alert other players of their existence. The most common sprays being the classic "Sandvich Dispenser, High Five for free Sandvich" and "Hunting Hoovies will result in a fine of (insert TF2 currency amount)".
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The chat
Hoovies will often spam the "Dispenser here" voice command, which is the origin of his famous phrase "Pootis". Some more advanced Hoovies may use the Showdown taunt (kill taunt for the stock Fists and the Holiday Punch) along with their voice line "Pootis Spencer Here" cut off by the voice line for Showdown, to appear as if saying, "Pootis POW!".
I hope the guide will help you in your future endeavours
-Mr.P