look up anything, like your first name:
1. ranktastic
a person or object that is extremely minging or disgusting i.e fantastically rank.
Wow your face is ranktastic
2. Ranktastic
an adjective for a person/object which isn't just "rank" (disgusting/minging/rancid etc) but fantastically rank!

another way for saying just how disgusting something is.
guy: Hey did you see that naked picture of *name*
guy2: Yeah, it was ranktastic!
rss and gcal