This is when you are receiving a blowjob
from a woman and when she pulls back, you then proceed to grab her by the hair and thrust her face into your nutsack
, humming the Captain America theme. And when she pulls back with an angry look in her eyes, you put your hands over your eyes in a mask style, and scream "JUSTICE!"
Man 1: Hey, isn't your girlfriend mad at you, bro
Man 2: "Yeah, she's mad because last night she pulled back and I Captain America'd that ass."