Taking a sip from a friend's drink bottle without your lips touching the rim, amid fears of backwash. Depending on the season, the spread of meningitis may also be a concern.
To refuse to fancy one's interlocutor by not accepting to listen to or be interested in the bullshit protruding from his or her pie-hole.
My boss just walked his ass up the stairs to come and order me to create another dumb asspowerpoint presentation and I informed him that I ain't gonna take no lip today!