You press Z if you're using the GameCube controller. If not, just press the "throw button".
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HUH? What are you talking about? You don't GET ANY bosses in any way, other than as Trophies, which you do by doing the final blow to the boss with a Trophy Stand item and then picking it up before the match ends.
To drop items, you go to your inventory, right click on the item you want to drop, then use the drop command.
U try throughing everything at the employee of the month poster and for each item try it twenty five times
press the # keys to select the items, and select an item and press backspace to drop it
To drop an item on Roblox, press the backspace button. Be aware, the thing might bounce back and get in your inventory. Try backing away while dropping it.