look up any word, like bootylicious:
1. PEC
Performance Enhancing Coke. A Coca Cola that gives you an "edge" in upcoming competitive sports/performance.
Luke drinks a PEC before football.
2. PEC
Adjective, When someone is a Poor Effort Cunt.

Meaning they are giving a poor effort at trying to be cool.
Jarred is such a pec.
3. pec
pussy eating click
Those guys are part of the PEC
rss and gcal