A person one has sex with despite them being unattractive, purely because one has not had any action for quite some time. The Purpose of such sexual escapades being to bust the your sexual "funk".
A)Bro I totally banged that fat chick!
B) For realsies? she was ugly as fuck man what were you thinking?
A)Its cool I have had a dry spell I needed a funkbuster nahmean?
B)Innit.
Kiljoy, stick in the mud; everyone is having FUN FUN FUN, and this person acts as though he or she is not having FUN ...a real terd ...and Fuck 'em, feed 'em fishheads type person "a FUNBUSTER!!!"