To "collins" is to give up and quit, or to bail out. When you "collins" on someone this means that you have made a previous agreement to fullfill, and instead of fullfilling the agreement you abandon your friend(s).
== Etymology ==
From a man "Collins" who self proclaimed being originated in Yensdale. After various attempts of advocating "Collins" to not give up or bail on his friends, they deemed him as un-helpable and used his name in a negative manner from there on.
I'm going to have to collins on you tonight. I'm going to spend time with my lame girlfriend instead of go to the bar with you tonight, even though I previously said I would go to the bar with you tonight.