Absolutely
disgusting,
gross to the point of throwing up on to the dude/dudette next to you. If you are pushed to the point of Grankiness, its necessary to warn others to clear out.
To grand would mean to
puke.
Also can be used as a substitute for made out. Or making out.
Example 1:
Dude 1: Oh Man! That smells absolutely Granky!
Dude 2: Yeah i think I'm gonna grank everywhere!
Example 2:
Ryan: Dang
Cole's girlfriend is so
hot.
Tyler: Yeah man, i would totally grank her.
Cole: Yeah, i am granking her.