A derogatory term, can be used as an adjective, or in its verb form. Originates from avoiding "Word Filter Lad"
Also see Mooseking
Young Child - "Oh my word, I seem to have fallen into a mutated pile of shteaming monkey phlegm and stained my long johns"
Lad - "MO5KING!!!"
Person 1 - "What are you doing pete lad?"
Pete lad - "I am Mo5king you"