vulgar slang To have sex or receive oral sex. Typically said of a male ("knob" is a vulgar slang term for the penis). If Brett didn't come home last night, I bet it's because he got his knob polished.
get one’s knob polished
tv. to copulate or otherwise have sex. (Refers to a male. Usually objectionable.) Man, if you want to get your knob polished, just let me know. I got girls! I got girls you wouldn’t believe!