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3.
A fantastic plan; a plan that comes together seamlessly
"I'm going to go to dinner and then call you later to meet up with you at the party," said Tina.

"Plan-tastic!" said Cici
by plumrose March 16, 2009
 
1.
fantastic, but only in instances of devising an enjoyable encounter
GUY: I will collect you at eleven, and then we go to bar.
GIRL: Sounds perfect.
GUY: I love it when a plan comes together.
GIRL: It's plantastic!
by H. Guakomoli October 19, 2011
 
2.
Short for a 'Fantastic Plan'
awwwww yeaaaaa that's plantastic!
by J Bloggz August 11, 2011