When a male invades somebody elses personal space in such a way that they feel uncomfortable about the proximity of his knob to their body even though it is not touching them.
At a train station if you wished to follow somebody through the ticket barriers to avoid paying the fare you could knob worry your way through by following them very closly.
Dave: "I went to london last night and knob worried my way through the gates at King's Cross and saved myself a tenner."
Ben: "Cool".
Dave: "I am going knob worrying down the library. Do you want to come?"
Ben: "OK".
The automatic come back to anybody asking any question any time of day.. this can be fallowed by the appropriate sentence, WHY ARE YOU WORRYING, and also, "Its so cute when you worry" which is said at a baby like cute like voice. and the first 2 are said at a lower level of a question of cuteness