A British term, given to someone who says something stupid or makes a stupid remark, usually due to living a sheltered life and having little exposure or knowledge about the world around them.
Cool Guy: I pollywopped your mom so hard last night that it left a mark
Gay Guy: What's a pollywop?
Cool Guy: Slapping your dick on her face so hard it makes a wop sound.
Gay Guy: You mean a cockslap.
Cool Guy: No. You're a fag