To flex your biceps while doing random things the way San Francisco quarterback Colin Kaepernick does when he scores touchdowns.
After a good workout I start Kaepernicking before I leave the gym
To flex your bicep and kiss it in celebratory fashion. Inspired and trademarked by San Francisco 49ers quarterback Colin Kaepernick.
Colin Kaepernick just ran for a touchdown to take the lead and is showing his celebration by kaepernicking to the crowd.