Don't Tas Me Bro!
A last minute plea for mercy. This phrase is usually uttered seconds before an inevitable beat-down or an encounter with overwhelming force which has usually been asked for by over-the-top behavior on the part of the victim.
(First uttered by Univerity of Florida college student Andrew Meyer just before he was tasered by University of Florida police during a John Kerry appearance at UF.)  
"When I finally caught my little brother and administered a much-deserved noogie, he kept yelling 'Don't tas me bro!' while screaming like a little girl."