when you say to your best friends sister(the sister also happens to be your gfs best friend) with your gf standing right their... wanna fuck? ill dump the stupid bitch that im dating and we can fuck... and then you turn to your girl and dump her befor you get an answer from the other girl... and then the other girl says no... and then you wake up, and rember that your best friend dosent have a sister... yep... fun fun..(well he dose have a sister, but shes like twice your age... married, and has 5 kids...