Green’s Dictionary of Slang

blooming adj.2

[SE bloom]

(US campus) excellent.

[US]C.F. Lummis letter 10 Jan. in Byrkit Letters from the Southwest (1989) 244: I undoubtedly acquired for myself thereby the reputation of a blooming crank.
[UK]C. Deveureux Venus in India II 275: With my fingers still throbbing from these exquisite contacts with two such blooming cunts.
[US]W.C. Gore Student Sl. in Cohen (1997) 18: blooming a. 1. Very good; first rate.