The process in which two or more people notice that one of their friends is walking/flirting
with a person that is way too attractive for them. Thus, to break up the social engagement the initial group that noticed the flirting
catches up to the canoodling
couple and initiates a conversation to prevent the pair from flirting
Guy A: Dude, did you see Carl and Vanessa walking to class together.
Guy B: No, why?
Guy A: He was hitting on her like crazy.
Guy B: Wow, that's not even reasonable; she's way hotter than he is.
Guy A: You thinking what I'm thinking?
Guy B and Guy A in unison: Walk, talk, and cock block.
(They grab their books and run after Carl and Vanessa in hopes of killing the mood.)