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1.
Bowsie is a term for someone you consider, a messer, or a divel.

Generally used between Males in Dublin
Guy1: Oh man i got so drunk last night i cheat on my girlfriend twice...

Guy2: Gew on ya bowsie

Tiger Woods, Bill Clinton, Mal Murphy
by TheBowsie March 26, 2010
 
2.
a Dublin term-for a scumbag/Kancker/scanger!!
he's a bowsie!
by Diarmuid January 08, 2004