Can mean many things and used in many ways.
Variation of cock, retard, douche, loser, ass, fag, queer, asswipe, penis wrinkle, asshole, or the occasional turd, as well as related words. Primarily used as an insult if being targeted towards someone.
Can be inserted anywhere to spice up a sentence. Mainly used as a noun, but can also be used as a verb. Rarely used as an adjective, buts "hukbrog-ing-ly" may be used as an adverb.
Shannon: i'm going to ignore you, kthxbai.
Nick: STFU HUKBROG!!
Nick: fine....ima go have fun with my hukbrog....
Nick: that really didn't come out right.... >_<