Definition of "upful"

The dope conceptual beauty of the Jungle Brothers is the upful spin they put on black consciousness music, showing that being pro-black can be as much about hot fun in the summertime as gearing up for the next time.

1990, SPIN, volume 5, number 10, page 74

[…] the soaring music - the string stabs, the upful drums, the scratches, the grain of her voice […]

2003, Peter Buckley, The Rough Guide to Rock, page 400

The contrast between the fretful lyrics and upful music is the source of the album's uncommon power.

2011, Dorian Lynskey, 33 Revolutions Per Minute, page 1845