The verb cock slap (pronounced: kOk slæp), means to slap something with your cock (penis), etc. the head of a person!
Victim: Hey dude could you cock slap the caps lock for me? All my fingers are busy with typing in my hax0rz
Observer (The Slapper): *Tries to slap his cock into the caps lock and the sound 'slap' appears as if it has hit skin instead of a key on the keyboard*
Victim: Damn dude! Not my head! The caps lock! Even the same letters appear in the word man.. CAPS LOCK - COCK SLAP! How tough can it be?!
Observer (The Slapper): Sorry man, it's tough to aim for such a tiny target!