A friend who is jealous of your relationship (of any kind) and he/she goes after your significant other and succeeds.
My girlfriend left me for that dirty mooch because he was better in bed

I want to beat the hell out of that dirty mooch who stole my crush at the party!

Sorry I’m a dirty mooch, but just saying it’s for the better.
by Onlyme4you April 1, 2020
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Someone who is jealous of a friends relationship, goes after him/her and succeeds
I left the party becauseI found my girlfriend with that dirty mooch
by Onlyme4you April 1, 2020
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