Used when someone doesn't do you the slightest of favors or when someone does something so stupid that they should of known not to do it because it was so blatantly dumb!
"oh Sean, so your driving past the the shop on ya way home! Sweet can i grab a lift and jump out at the shop then yeah?" Sean: "Nah"
Tone didnt fill out his job search for the job centre yesterday, the one thing he has to do that takes about 4 minutes once a fortnight, and they stopped his money!