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1.
1. To convey an expression of awesomeness,epicness or uberness.

2. A spectacular fuck.

3. A lay so epic/uber/awesome/ultimate/super that the orgasm you get is just mother fucking ecstasy.

4. A super fuck that may break your bed
Dude ,she was a great catch but sex with her sister was motherfucking fucktaculous !!!
by Cupcke27 May 27, 2011
 
2.
Usually an interjection, meaning, spectacular! or wonderful!
This is absolutely fucktaculous! I had a fucktaculous time at the party last night!
by Alex Cummings October 24, 2003