Up Down ( Do This All Day ) is a hit song by T-Pain .
T-Pain has also released a string of hit singles , including `` I 'm Sprung '' , `` I 'm 'n Luv ( Wit a Stripper ) '' , `` Buy U a Drank ( Shawty Snappin ' ) '' , `` Bartender '' , `` Ca n't Believe It '' , `` 5 O'Clock '' and more .
T-Pain