1)When the nuts of a man start to sag because he is getting to old to have nice none saggy nuts
2)When your ex-boyfriend starts going out with your bestfriend, this man is sag nuts.
Jamie-You wouldnt believe what just happened
Lauren-What? Tell me!
Jamie-My ex-boyfriend and my best friend are together.
Lauren-O my gosh, what a sag nuts
The feeling you get when life is going great, and you are flyin high on the feeling
Dude 1-Hey man how are feeling today
Dude2-Ballerific, i just got my paycheck, i just saw my girl, and check out my new nikes