"...Brent just loves antagonizing his sister but he knows better than to mess with me after that atomic wedgie I gave him once,” Tanner said with a grin.
“Yeah he was pulling his underwear out of his butt crack for at least a month,” Joshua said as he and Tanner giggled uncontrollably.

He shut his brother up with the simple expedient of giving him an atomic wedgie, Mandalor-family style.
“You son of a bitch! I think you just ruptured a testicle,” Dom howled.
“I thought you'd given up balls for Lent,” Leandro said

Atomic wedgie

Meaning

Noun