Helium'd

Helium is a known element used on balloons to make it float. However, in Soldier-Front terms, Helium is a player from Element clan who's known for carrying his team into battles. Known for being "light headed" and "sort of on drugs (high)" when killing enemies, he was coined Helium and so he adapted the name. So basically, Helium'd is the act of being "owned/pwned".