Da grudgingly-resentful politeness dat you receive from an overworked-and-underpaid employee or other businessperson who is expected to behave civilly to you, but doesn't feel like doing so for whatever reason.
Ethan Couch had aggravated da school faculty so much dat it's a wonder if they were able to extend more than just common curtesy towards him.
The act of cracking an individual—having sex with them— out of well… curtesy. Often used as a thank you, congratulations, or more commonly as a parting gift.
Bill: Yo, wanna hear something?
Bob: What’s up man?
Bill: Tanner heard I was moving out of town and we had a Curtesy Crack. Bro was grateful for giving him a place to crash 2 hears ago.
Bob: Shi— I hope I get a Curtesy Crack when I graduate from my MBA!