A typical "muck" session may include the following: hand gestures, loud laughs, stupid inside jokes, pointless conversation, & rude comments.
(All while a women is trying to get something done, or needs assistance, or is in a rush to be some place.)
"Lindsey, why were you late for my baby shower?"
"I'm sorry, Derek ran into an old friend & they mucked it up for hours!"
I can NEVER shop with my father because he finds someone to "muck" with, in every store!