When a person Team Kills (TK) in a really idiotic and obvious way. Such is the case when the teamate is standing in front of the subai-er for around 5 seconds before being sent to his/her miserable death.
Noun : OMG YOUR SUCH A SUBAI FFS U SUCK U IDIOT!!!
Or a verb : AH CRAP I JUST SUBAI'ed HIM IM SO DUMB!!! SORRY SORRY ^^;