If you are overwhelmingly happy about something you completely agree with you would use this phrase. Some people just use fer sure, this is just a more intense version of the phrase. Made popular by a song by the Medic Droid.
Eric: I just got these stellar tickets to go see this band, and I have an extra one, would you want to go?
Jamie: fer sure bomb!
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Basically saying yes, but something more sarcastic like "of course, you didn't even have to ask that"
Jamie: ganna see him when you come home?
Scotty: yeshh
Jamie: yayz for you!
Scotty: yeshh
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