A person who lacks the ability to think like a capable human, ie an idiot.
Derives from the fact that donuts have a hole in them, something is missing just like something is missing in their head.
Siphora is a donut.
the act of getting 0 kills within in a round/game in a multiplayer game.
this guy is calling me bad even though he got a donut last game
Policeman: ah, that guy just killed 10 people and robbed a bank who gave him free drugs. I should probably arrest him....
But there is a sale on donuts...
Policeman: *buys donuts and gets killed by that guy*
Policeman: awww, I didn't get to eat the whole donut :(
That guy: *eats the donut*
Policeman: *soBs* D':
Policeman 1: falls right next to a robber
Policeman 2: you fucking donut
Policeman 1: yumm *starts licking and biting himself*
Donut is when you feel the urge to nut on your friend's doughnut.
Friend1: ewww jason why is my doughnut filled with your sperm.
Jason: sorry I had a donut.