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A yammo can have a few different definitions, depending on context. In general, it is used to refer to a person who is or is acting like an idiot, fool, moron, dimwit, simpleton, tool, lunk head, asshole, jerk, etc.
That guy almost cut me off! Fucking yammo!

I can't believe he didn't know her name was Mulva. What a yammo.

Don't be such a yammo - VOTE.
by girljme June 14, 2018
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2
A prostitute's gold tooth, according to a few I've heard. Not sure if it is really a widespread term.
"Look at the Yammo on that fuckin prostitute! She needs to go to the dentist"
by Johnny April 02, 2005
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