A combination of the words "friend" and the shortening of roommate ("roomie"). It describes two people who are not only roommates but also close friends and confidantes.
Friend: Hey, I noticed you two spend a lot of time together and you live together, you must be good friends.
Froomie 1: We're more than good friends...
Froomie 2: ...We're froomies!
Froomie 1: We're more than good friends...
Froomie 2: ...We're froomies!
by word_wizard February 17, 2009