You Gotta be Strokin' Me
A phrase usually used in disbelief, has the same meaning as you gotta be kidding me.
Zach: Dude did you hear Phil hooked up with another fat chick?
Alex: No way! you gotta be strokin' me! That's the 3rd one this week
Alex: No way! you gotta be strokin' me! That's the 3rd one this week