I was actually able to incorporate "mollywhop" into conversation a number of times about 7 - 10 years back. One of the guys at work used to jokingly talk shit about how tough he was, and a few times pretend squared up with me saying I wasn't shit. I had heard the "mollywhop" expression on TV or in a movie just prior, and stood with him and looked down and said - "Man ... you're 50+, 5'6" and 160lbs soaking wet. You don't exercise or workout. I am nearly 30 years younger, 6'3", 220lbs, and I workout. You would get wrecked. Straight up mollywhopped."
We all laughed (few people watching) and that was our running joke whenever we would square up. He'd still talk about his toughness. I'd remind him he would get wrecked.
I will admit ... he got me good one day. He had mentioned going to visit his girlfriend out of town, and turns out she had the same name as my mom.
I mistakenly said "Shit ... that's my mom's name."
He started chuckling and said ... "Man ... maybe I'll be your father. Your stepfather. Watch out, son."
I wasn't sure how to respond, and said - "You'd still get mollywhopped, pops."


Molly whop (one)
To strike, slap, or slam into one, either once or repeatedly; to wallop one. The term is sometimes hyphenated, and sometimes both, or neither, "Molly" and "whop" are capitalized. I'm gonna Molly-whop you if you don't shut your mouth! The car sped through the red life and Molly Whopped van that had started to drive forward.
See also: molly, whop