It means having "friends with benefits" such as you can have sex, kiss, hold hands, cuddle and do things that couples do in relationships but you have no emotional attachments. You don't have to care about their feelings being hurt when you are with another person.
Ty: Damn, Tyler and Lianna look like they are together by always holding hands and having sex
Tony: NO, they are just Friend-a-fits.
Tony: NO, they are just Friend-a-fits.
by Tiffany L. February 28, 2008
Similar to the more common "friends with benefits" expression, but the participants engage only in "clothes-on" acts, e.g. light making out, cuddling, and extreme cuddling.
"Damn, man! You got Janine to agree to be friends with benefits?"
"Nah, dude. We're just friends with fits."
"Nah, dude. We're just friends with fits."
by O'Heineys Slang Police January 16, 2012
Oh shit, here comes Larry. He's one of my friends with beaner fits so we are sure to get a forty five minute lecture about too many Mexicans in the United States.
by trishamallen December 25, 2010