The last sip of water (or other beverage) left as a courtesy for the recipient of a guy’s load, post-oral. Necessary when he knows he won’t want to get up to refill the glass completely.
Bro 1: “Bro, I got the craziest head from my girl last night”
Bro 2: “Yo, did you leave her the gentleman’s sip?”
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.