Top definition
An idiot, a bit of a tool. Usually directed towards a female in a flirty insulting way.

Also

Cum face or sex face.
"I don't want to go out for lunch"

"Oh don't be a bonk face!"

Or

"Brenda said I had a great bonk face last night when I spunked all over her tits"
by Clungeplunger March 21, 2013
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