suprisingly, the 'k' is pronounced. knublets are nubs that sway back and forth when they get nervous or excited. in tense moments, knublets can be observed swaying at high enough speeds to generate a distinct humming sound.
at a lan party:
player1: do you hear that sound?
player2: yeah, it's a knublet, you fuckin nub. ignore it and zerg rush, k?
A problem of the male genitalia such as an STI, a direct hit by an oject (accidental or meant) or the worst kind, catching of said weapon in the flies of your trousers
"what's up John mate? You're walking a little gingerly" "oh Les, took one to the hang down off one of the kids this morning and its throbbing" "quick, get John some ice he's got a right knoblem