You half-assed getting the phone back! (He supposed to get the phone back but he got caught in the middle of getting the phone. So his captain rebuke him.)
Is "half-assed" used as a verb here?
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Yes, "half-assed" is usually an adjective, but here it is being used as a verb.
The meaning is "You did a half-assed job of getting the phone back" or, less colloquially, "You approached the task of getting the phone back with insufficient diligence and/or competence."
Though you're probably already aware of this, it may be worth mentioning that "half-assed," as an adjective or a verb, is widely seen as vulgar.
This is not a common usage. But using nouns as verbs, (verbing nouns) particularly in informal speech, is generally common. Certainly the meaning here is clear and would be understood by any fluent speaker.