Bind a key to "kill"
Schadenfreude taunt

Step 1: Go to the options button (Not to be confused with advanced options)
Step 2: Click the "Advanced" button
Step 3: Click the box that says "Enable developer console" beside it. Then click OK.
Step 4: Look at your keyboard and towards the left side of it. Press the key that is above the tab key, left to the 1 key but below the ESC key.
Step 5: This will bring up a console window. It looks very complicated but try not to panic. You want to focus on the bottom of the console window as that is where you will be able to make the magic happen. Click on the bar next to the submit button and a flashing line will appear at the bottom left side of the console window.
Step 6: Type bind, press the space bar and then select a key that you would like to use (I would recommend the N or M key) then press the space bar again. Hold the shift key and press the 2 key in order to make a quotation mark (It looks like this -> ").
Step 7: Now you can choose between either kill or explode. Kill just makes your character go limp but explode makes your character explode into giblets. It's up to you to decide which one you want to type in so type in either kill or explode and hold shift and press the 2 key again to make another quotation mark.
Step 8: Wonderful! Now go join a game and see if it works! If it does, your character should either go limp with kill or explode with explode when you press the key.

Step 1: Find an enemy player who isn't willing to kill you.
Step 2: Press x to bring up a list of vocal commands
Step 3: Press 2 with your cross hair directly on the player you wish to interact with. Your character will then contextually call the player a spy.
Step 4: Wait for the other player's response.
Step 5: Shoot them once then press the G key to taunt
Step 6: Press your kill or explode key to die and if all goes well the other player will killbind as well.