What is Grrtrr?
1.
To finger somebody in the ass, vagina, or peehole.
Except you use your toes instead of your fingers.
Billy: "Hey man guess what, I finally hit my gf's g-spot!!!"
Gray: "Really? WOOW finally, aren't you too small though?"
Billy: "SHUT UP! I Grrtrr'd her instead"
See