Unlike the traditional use of the word loose, loose behaviour is a versatile word that can be used to describe someone that is a shady character, also it is a good or bad response from a person depending on the circumstances and actions involved.
1 - throwing the phone off the third story balcony at a hotel was loose behavior.
2 - You were so wasted last night your behavior was loose.
3 - Drinking underage in a manner that gets you and your friends arested.
This term refers to being on your best behavior when doing bad ass masculine shit like climbing rugged peaks so people put up with you and don't push you off a cliff.
There are many unspoken rules of good Expedition Behavior such as:
Don't fart in the tent.
Try to retain some hygiene- other people have to look at and smell you.
Don't be a lazy ass- carry your own weight.
Don't be cocky.
Joe was not on his best Expedition Behavior. He chewed his ramen with his fucking mouth open, smelled like a rotten llama, and bitched about his hangnail while we were summiting the north face of K2. Therefore Joe is no longer with us- he never made it down the mountain and there were no witnesses.