Oblivious cock 

This is when a mans cock cannot control itself and get hard when anything passes by it and sometimes it can cum more than you want

"Wow Billy had a really oblivious cock last night." Said Ashley

Oblivious cock by Tttthhhee October 5, 2017

Oblivious Cock Block 

When a parent is unknowingly cockblocking their kid by being home. The parent is at home, leaving the kid and his girlfriend with no place to get it on. Therefore the parent is obliviously cock blocking.

Matt's Friend: "Yo Matt, did Katie come over last night?"
Matt: "Yeah, but my parent were being complete oblivious cock blockers!"

Oblivious Cock Block by StonedSteve March 8, 2009