mates before dates 

to choose your friends over your girl/boyfriend.

usually used by a third party... "you should have come to leopolds's birthday party instead of her parent's wife swapping party, mates before dates."

or

"ofcourse i'm coming to leopolds's birthday party, mates before dates, right?"

mates before dates by Tankman R. January 8, 2008

Mates before Dates 

When you're mate wants you to fuck their BF/GF and you can't do it cos you have too much self respect and you honor your friendships.

Mate 1: Mate, you should help me fuck Chelsea! She's gaggin for you!
Mate 2: Sorry man, i don't fuck my mates' girlfriends. Mates before dates bud, mates before dates.

Mates before Dates by Jeed January 13, 2009

date before mate 

Olivia is ring it’s mate before date

Olivia I can’t go out with you cause Logan date before mate

date before mate by Mryourrong January 4, 2018