A colorful statement used to express the idea that the recipient of the message is going to do something, somewhere with the person who used the phrase. This phrase is a reference to the 2004
cult classic,
Mean Girls, in which the character
Regina George proclaims, "Get in loser, we're going shopping!".
So Then,
Michaela pulls up and says, "Get in loser, we're going
shoplifting". What else could I do, but go?