kaepernickous
When you flex your biceps while doing random stuff, like celebrating, eating a taco, or just walking around like you're the main character of a movie.
"I flexed my bicep while eating a taco like I was in a commercial!", A guy who flexed during lunch.
"I flexed my bicep while walking like I was the main character of a movie!", A guy who flexed during a walk.
"I flexed my bicep while drinking a soda like it was a victory!", A guy who flexed during a break.