B'tickle
A b'tickle is like a tickle war, but your butt is the battlefield, and you’re the one getting stabbed with laughter.
My brother started a b'tickle war in the living room, and it lasted for two hours.
My dad did a b'tickle during dinner, and I dropped my fork.
At the mall, a stranger did a b'tickle and I had to go to the bathroom to recover.