Green’s Dictionary of Slang

upfull adj.

(W.I./Rasta) positive, encouraging.

1979

Daily News (Kingston, Jam.) 7 Sept. 8: Ghetto poet Oku Onuora is desperately trying to move poetry out of the so-called ‘high-society bracket’ and reach the masses which have been totally deprived of ‘upfull and conscious reasoning.’.

In derivatives

upfullness (n.)

healthy living, mental clarity.

1995

Francis-Jackson Official Dancehall Dict. 53: Up-fullness clean, healthy living; straight-forwardness.