gassed(-out), adj. — Green’s Dictionary of Slang

gassed(-out) adj.

[one has run out of gas n.¹ (2)]

(US) worn out, exhausted.

1964		Smith & Hoefer Music 21: Today, if they go four rounds with gloves they’re gassed-out and ready for the sponge [HDAS].
2006		(con. 1972) Jurgenson & Cea Circle of Six 8: They [i.e. patrolmen] were drenched in sweat and completely gassed.
2013		C. Dundas ‘Rightful King of Wrestling’ in ThugLit Nov.-Dec. [ebook] We went forty minutes at a pretty good pace [...] and I could tell he was gassed.