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When something is so amazing, that it rivals the consistency of Flan. In theory.
Lee: Dude, this essay is totally...totally...I can't think of a word!!!!!!!

Kerry: Flantastic.

Lee: Flantastic???

Kerry: Yes.

Lee: What!?!?! That doesn't make sense!

Kerry: It does if you have a 12th level intellect. Do you?

Lee: ...no, I don't know what that is.

Kerry: Then you don't have it, so shut up.
by Staff Sergeant Kerry Hicks October 19, 2007
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When something is so amazing, that it rivals the consistency of Flan. Which is solid but flexible, making it something to depend on.
Dude: Dude, this essay is totally...totally...I can't think of a word!!!!!!!

Me: Flantastic.

Dude: Flantastic???

Me: Yes.

Dude: What!?!?! That doesn't make sense!

Me: It does if you have a 12th level intellect. Do you?

Dude: ...no, I don't know what that is.

Me: Then you don't have it, so shut up.
by Staff Sergeant Hicks October 25, 2007
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way more awesome than regular fantastic.
wow, that song was executed way more flantasticly than the original version.


or



hello jane, i just think its really flantastic that you decided to try the at home abortion kit.
by teddddi is redddi October 28, 2008
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If something is Flantastic it is extremely jewish, sticky, and dirty. A flantastic item would be something like a used uncleaned double-dong and doing a flanstastic deed would be like giving yourself or another person the reverse shocker.

If someone is called flantastic it means they are easy, slutty, and/or dirty.
Dude that bitch was so flantastic in bed! She let me use her any way I wanted!!
by BATGOD December 06, 2006
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