Drop-Off can be used in many litteral contexts and has different meanings. First of all, it is in the yugioh card game. It is a card what makes the opponent discard the card he/she has drew. Therefore upsetting them a lot.
Drop-Off is also know as dropping someone off, or getting rid of them because there an annoyance.
Oh my god Tyler i drew Jinzo and you played Drop-Off...i wish i had my seven tools of bandit on the playing field.
Tyler: Kyle i dropped of Kaite! Hahahahaha
Kyle: Nice i wish i could too! But i don't have that card!