-tastic /tæstɪk/ suffix [in adjectives] informal
used after a noun to describe something as being or involving something very good:
You can win tickets for this rocktastic show (=show with very good rock songs) .
-tastic /tæstɪk/ suffix [in adjectives] informal
used after a noun to describe something as being or involving something very good:
You can win tickets for this rocktastic show (=show with very good rock songs) .
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012