What is Boomtime!?
1.
A form of exclamation which originated in Glasgow, Scotland.
Used to expresses ones interest, excitement or approval when talking about something.
1st Person: "Hey, I got tickets to go and see Justice at the Arches!"
2nd Person: "BOOMTIME mate!"
OR
"I got 5 A's in my exams! BOOMTIME!"
See 
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1. 
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1. 
An almost sarcastic response to something so seemingly simple you shouldn't have to ask the question to begin with. Could also be a..