Plaster is just another word for Band-Aid. They are used to protect a small cuts and wounds from infection.
Pass me a plaster I cut my finger.
by Logansmorf April 19, 2004
When one pulls out his penis to ejaculate all over the girls face. also see sperm spackle.
"By the time i got done pounding that chick, I left plaster all over her.
by ttboy September 09, 2004
Noun. Arse (mainly UK and Australia, slang, vulgar). A rare example of triple rhyming slang: Plaster = Plaster of Paris = Aris; Aris = Aristotle = bottle; bottle = bottle and glass = arse.
by Lexeme the Wordsmith August 05, 2008