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2.
"mutual friend" is a pseudonym for the internet, or an internet dating site, when used to cover "how do you know...?" "oh, we met through a mutual friend"
"how do you know so and so?" "Oh, we met through a mutual friend" (translation: we met through an internet dating site looking for freaky people who like this and that...)
by duffmanco April 19, 2009
 
1.
friends of the same friends

tom meet jerry through bob. bob is friends with both tom and jerry. so now tom and jerry are friends.

soooo tom meet jerry through a mutual friends/friend.
by mmmashley November 17, 2007
 
3.
A girl who has been fucked by two guys (simultaneously or in different points of time) is their mutual friend.

Or a guy who has slept with two girls is also their mutual friend.
- Hey, guess what, I slept with Annie the other night! She was hella awesome in bed.
- Then I guess she’s our mutual friend now!
by Ershadsky January 18, 2014
 
4.
These are friends on Facebook that you and another person have in common. That is, both of you know those people.
Robbie and I have 180 mutual friends on Facebook. How do I still not know who he is?!
by surf4ocnj October 18, 2011