Definition of Like a shot

Babylon English Dictionary
suddenly, "in the blink of an eye"; very gladly, very willingly
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Like a shot Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Adverb
1. without delay or hesitation; with no time intervening; "he answered immediately"; "found an answer straightaway"; "an official accused of dishonesty should be suspended forthwith"; "Come here now!"
(synonym) immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, in real time