A person that constantly repeats a catchphrase or word with the soul purpose to annoy his surroundings. The amusing/interacting part is that it sometimes takes time to understand the joke, but ones you understand it it gets old pretty fast.
Dude: Can you pass me a beer?
Heckto: Kok mi sok!
Dude: Dude, shut up and give me a beer.
Heckto: Kok mi sok?
Dude: OMG, give me a beer man.
Dude: Fuck you, Heckto!
A degeneration of "suck my cock" pronounced like a careless Irish pub owner just refusing you your last pint when your already completely wasted. The careless tone is of necessity to strengthen the confusion of your target. It works as confusing on sober people as it does on intoxicated ones.
Dude#1(on phone): Hey man, can you bring some beer to the party?
Heckto: Kok mi sok! (hangs up)
Dude#2: What did he say?
Dude#1: I am not sure...