to claim something. A claim expressing priority over an object.To have the rights to something, to own something.
In english: dibs
prem's is a short word for "premier" (1er) in english: "first" (1st)
You call prem's on a object,means you be the first to use it.
dude:hey guys,i got myself a brand new car,who wants to try it?
Look at that guy! Ugggh he is nearly as ugly as prem!