2. A phrase used in place of the popular expression "Burn!" made famous by That 70's Show. (Used mostly when the burnee can't take a joke and they're visibly upset. Much more enjoyable to say if they're offended. This saying is often situational.)
3. An expression used anytime you yourself outdoes someone else- i.e., video games, sports, living, etc.
You: "And you think I care?" "If you want sympathy tell your mom!"
Them: "Dude, I just totally balled that guy on the court."
You: I always knew you liked dudes,
Them: Fuck you, man! I'm not gay!
You: Tell your mom!
You: "Oh my God, did you just see that!?" "Tell your mom!"