Definitions by KernelCore

DSF 

Designated Sober Friend.

That one friend who doesn't drink or smoke at all, but comes with you to all the parties. Sometimes they might get made fun of, but you can always depend on them to get you home.

"Hey, wanna hit up Delta Upsilon tonight?"
"Sure! I'll grab Katie, she's a great DSF."

DSF by KernelCore October 1, 2014