1. The act of interfering with anothers attempts to gratify themselves. Usualy sexualy, but does not have to be.
2. Hatin. Being a Hater. Interupting ones advances upon another individual.
1. Yo, I tried to fuck Keshia but her sister was cockblockin by staying in the room with us.
2. Im tryna get my freak on with this chick in the club, but the bouncer keeps cockblockin.