1 definition by Aylusia
Someone all your friends like so you act like you like them too even though you'd never hang out with just them. A friend of a friend who you feel obliged to invite to group gatherings so as not to offend your actual friends. Includes friend's significant others.
Yeah honey, I've invited Jerry, Dave and George, guess we better invite our collateral friend too. What's Steve's number again?
by Aylusia October 23, 2017