You bump into someone you don't like, they clearly want a stop and chat but quick as a flash you say "must go" and start to leave, but they come along too still babbling shit. You're pissed off, you want to hit them, you're in a walk and talk. (Not as cool as it looks on the west wing).
Jim: Saw that tosser Mike today, tried to get me in a stop and chat but i said i had to rush to meet someone.
John: Good thinking.
Jim: yeah but the twat followed me, didn't he. Ended up in a walk and talk.