(Beh-key-tas-tick) adj.
1. A girl who is very prostitute-like see prostitute2. Something that is so ridiculously cool, there is no word to describe it.
3. A word that is not in the dictionary, and has no definite meaning.

1. Did you see Tina on the corner? She's being so Beckytastic lately.
2. Oh my God, no way! That is so freakin' Beckytastic!
3. Buttnugget is such a Beckytastic word.