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
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
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
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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