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1.
past participle, past tense of Arm·strong (Verb)

Verb:

1. Cripple (a team) by making a feeble attempt in a clutch situation.

2. Provide an incredibly stupid effort or answer to something.
"That guy just Armstrung his team by saying Felix Baumgartner reached a top speed of 165,000 km/h when in fact it was 1,342 km/h!"
by Giancarlo October 18, 2012