1. A person who is a wanna be gangster
2. A fake, whore, stupid slut, or anything along that line
that girl is trying too hard to be a whore, what a gagster.
a smelly fart, a real killer, somewhat like a nerve gas followed by a nasty log turd or syrupy diarrhea. gives an uncontrollable gag.
Man, you dont want to use that washroom; Jorge just ate the rest of the enchaladas and threw a stainy gagster.