adj. n. A person, ussually a female that her freind brings along on a first date in order to prevent you from having intercourse with her.
If that her FREIND wasnt such a cockblock i would have banged that girl!
I hate that girl's bestfreind, she's such a cockblocker.
I hate that girl's bestfreind, she's such a cockblocker.
by chris September 5, 2003