Those crazy, fun, fantastic times during one's teenage years. Those unique times that you can only experience when in your teens. Example: Upon spotting a group of teenagers having a good time, Looks like they're having a teentastic time. upon a new teen's 13th birthday that happens to fall on a Friday: have a teentastic weekend!
TEENTASTIC
Meaning of TEENTASTIC in English
Slang English vocab. Английский сленговый словарь. 2012