Two people that meet for the sole purpose of a work out. One partner usually knows enough about fitness and sports to help the other develop physically and meet a personal goal. An unemotional, homogeneous association between two people without a need for friendship.
John and Jane meet at the gym once weekly to work up a good sweat. They are sweat buddies.
I like to be with my sweat buddy when I workout because I hear positive karma about the future outcome of my sweat work.
Being sweat buddies is much less complex than being friends.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"