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1.
After taking a shit and standing up to wipe your arse, dropoff is the dod of shit that remains clinging to your hoop until you are upright, then falls off and lands on a number of places.... in your boxers, on the carpet, on your shoes etc... and is renowned for going un - noticed until it's too late.
"Yesterday in the office, Alan emerged from the gent's with mad dropoff down the back of his pants ! no - one told him and it ended up getting everywhere !"
by Drewbud315 July 05, 2007
 
2.
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!
by Tyfobird November 13, 2005