vial up, v. — Green’s Dictionary of Slang

vial up v.

[the SE vials in which the drug is sold]

(US drugs) to portion out crack cocaine into individual vials.

2002		Simon & Burns ‘The Buys’ Wire ser. 1 ep. 3 [TV script] ‘The shit is late.’ ‘Yeah. They still vialin’ up.’.
2006		Burns & Price ‘Corner Boys’ Wire ser. 4 ep. 8 [TV script] I gotta go an’ vial up with Lester an’ his package so’s I can re-up.