What is Sack-lunch?
1.
Somebody who never wants to go out and do anything fun. Can also be used for flaking. Taken from when you invite someone from work or school out to lunch and they say, "That's okay, I brought my own."
"So dude, you still goin' out tonight?"
"Naw, man, I think I'm staying in."
"Pff, aight sack-lunch I'll see ya later!"
*CLICK!
See