A move done in Team Fortress 2, a hat collecting simulation game, named after Taggerung, a former professionalTeam Fortress 2 player. The move involved jumping the enemy to gain an advantage for your team, it often involved getting a frag, getting a kill or a med drop. Taggerung mastered this act and had high success rates hence the name.
Dude did you see the HRG matches, the onlyreason they won was because of those tagg bombs.