the act of stealing a friend's romantic interest (typically used by girls).
Ex. 1) Girl, you got cockjacked by your more attractive friend, Hannah.

Ex. 2) Hey man, your jerk-ass friend is planning on cockjacking you.

Ex. 3) Annabelle unintentionally cockjacks every girl when they bring hot dates around.
by AddyHamilton December 19, 2011

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