When a student attempts to hide either an object or an action from a teacher during class, usually but not limited to using a notebook or binder to block the view.
Mr. D caught Pedro wallin' while he was explaining adjectives, so he made Pedro put his binder away.
Unlike it's commonly mistaken definition (wahlin or wylin), 'wallin' means to be stubborn or ignorant.
Wallin = You're stubborn and ignorant.
Brick Wallin = You're ignorant as hell.
Stone Wallin = You're stubborn as hell.
Brick AND Stone Wallin = You're just plain retarded.
1. Somebody who sucks at basketball but who thinks hes the shit.
2. Somebody that claims hes from the ghetto and now hes rich when all along he had money.
3. Someone who thinks hes ballin.
1. a: ''He scored a point and now he thinks he can beat all of us.''
b: ''yea, that cat is wallin.''
2. ''I herd he grew up in the burbz, hes wallin.''
3. '' Haha, he got af1's and he says hes a baller. That idiot is wallin.''