BITCHING

Adjective

bitching

(slang) Excellent; outstanding.

(slang, less common) Awful, terrible.

Verb

bitching

present participle of bitch

Noun

bitching (plural bitchings)

(vulgar, colloquial) A spiteful criticism or complaint.

Source: Wiktionary

BITCH

Bitch, n. Etym: [OE. biche, bicche, AS. bicce; cf. Icel. bikkja, G. betze, peize.]

1. The female of the canine kind, as of the dog, wolf, and fox.

2. An opprobrious name for a woman, especially a lewd woman. Pope.

Source: Webster’s Unabridged Dictionary 1913 Edition