buddy butter 

That mysterious stain on your clothes after a night of partying with your pals.

Brad woke up half drunk and noticed a spot of buddy butter on his shirt.

buddy butter by ford4wd July 23, 2012

Butter buddy 

One you have ate butter with

I was eating sticks of butter at McDonalds and saw my new butter buddy across the room drinking spray butter.

Butter buddy by CancerousButter September 12, 2017

Buttercup buddy

The act of two gay men fingering each others assholes.

"Man you so gay, I bet you have a buttercup buddy".

Buttercup buddy by Lucky enough May 11, 2017

Battery buddy 

Someone in Titanfall 2 who will give a battery to a teammate, rather than taking it for themselves. These are the most generous people in the whole game, and are awarded in accordance. The only person better would be an Omega Battery Buddy, who is someone that will give you a constant supply of batteries, usually using their boost, while you are in a titan.

1: God, my titan is such low health, I'm done for sure!
2: Nah, its fine dude, I've got a battery for you.
1: Wow, what a true battery buddy

*Battery Buddy is awarded with his own Titan*

Battery buddy by Vinman7122 June 2, 2018