1 definition by Miiike Jones
facebook gay marriage; when two girls or two guys have married relationship statuses with each other, often used by best friends as a joke that they are so tight that they are gay for each other.
1: Bro, did you hear that Mike and Jeff are in a relationship together? Do you think he's gay?
2: Nah man, he texted me saying its a fbgm.
2: Nah man, he texted me saying its a fbgm.
by Miiike Jones April 3, 2011