Boomer: Yall millennials are snowflakes and cant take jokes.
Millenial: Ok boomer!!
Boomer: Ok boomer is a slur.
Gene from behind the scenes: Shut up BOOMFLAKE
1. (n.) The face one makes when they exclaim, "Boom!".
2. (interj.) Exactly like exclaiming "Boom!" This works because it conjures the mental image of the face you would have made had you just said, "Boom!" (Note: typically is performed without actually making a boomface.)