A phrase referring to when someone's whining, grumbling, complaining, etc. The mobile refers to the device often hung over a baby's cradle for their soothing entertainment, as it spins around. Thus, "getting him (the complainer) a mobile" implies he is a cry-baby.
Mr. Truscott had to listen to all of the crying pleas of the physical education student, but then Marly quipped, "Hey, GET HIM A MOBILE" and Kemberling and Herzog were astoundished by this, as was the entire class. The gym student was INSTANTLY SCHOOLED!
The three words that are made by one who is trying to stop a fight that really does not exist and while doing so, throwing an item at the ground by their feet
Dallas: hey guys my bday is coming up what we gonna do is -
Seydou: YO BRO GET OFF HIM SON *throws Starbucks water at the ground*
Tyler: YO DALLAS TF YOU DOIN SON