PCS stands for Party Cosby-Style - when you plan for a night of debauchery that includes primarily alcohol and roofies. This may end up leading to sex that may or may not be consensual and conscious.
Frat dude: "Damn bruh - Rachel is coming tonight. We gonna PCS haaaaard!"
Abbreviation for PornCheerleader Sex. This is a code acronym for wild intercourse that involves blond lesbian pornography, sexy wife in cheerleader outfit and lots of great hot sex.
Imagine being in a public place with you spouse... “Hey honey, how about PCS tonight!?!?!” Now, if the question is answered in a positive way from the other person then great sex will be on both minds for the rest of the night.