This not an answer, but too long for a comment and adds to @Weather Vane's answer; the OED gives the following definition:-
poop, verb, colloquial, origin U.S.
To tire, to exhaust. So pooped exhausted, worn out.
With the following quotations:-
1931: Technol. Rev. Nov. 65/2 “If his engine poops or konks, he will
be forced down.”
1932: Amer. Speech VII. 335 “Pooped; all pooped, tired out;
exhausted.”
1934: J. T. Farrell Young Manhood xii. 187 “He was tired and pooped.”
1938: `E. Queen' Four of Hearts (1939) iv. 57 “He ain't had a drink in
five days. That would poop up any guy.”
1944: E. B. White Let. 15 May (1976) 253 “This would be a very bad
time to pull our exhaustion on our readers, a lot of whom are pretty
well pooped out themselves for one reason or another.”
1949: R. Chandler Little Sister xxx. 222 “Tired?' he asked.
Pooped.'”
1955: M. Dickens Winds of Heaven iv. 93 “He'd better be..or he'll find
his mother-in-law in the hospital with him. You've really pooped
yourself, mother.”
1957: D. Karp Leave me Alone xviii. 274, “I don't think he understood
me. The poor old guy is pooped out.”
1959: N. Mailer Advts. for Myself (1961) 45 “He remembered the old man
sitting on the porch..all pooped out after work.”
1960: Sunday Express 24 July 4/2 “Bringing up eight kids..really has
me pooped.”
1966: New Scientist 22 Sept. 658/1 “Lt Cdr Richard Gordon's space walk
was cut short because..`he was blinded by sweat and felt pooped'.”
1967: Time 2 June 33 “Paley Park offers pooped passers-by a respite at
little white tables and chairs in a setting of geraniums, honey locust
trees, and a 20-ft. waterfall.”
1971: B. Malamud Tenants 7 “If it [sc. the heating system] pooped out,
and it pooped often—the furnace had celebrated its fiftieth
birthday—you called the complaint number of Rent and Housing
Maintenance.”
1977: Time 18 Apr. 64/3 “Pheidippides..was so pooped by his
performance that he staggered into Athens.”