full-chub
A fully erect penis as large as it can possibly get. A dick more hard than a half-chub.
I banged that chick hard once I got a full-chub.
Full Chub
A full chub is not quite yet a full erection, as chub implies there is still limpness.
Tom M. was suprised when he pulled down his pants to see he had only a full chub as things between him and Bianca had gotten pretty hot and heavy. Bianca then put her mouth on the full chub to now make it fully erect.
Full-on Pata-chub
A massive, throbbing chub brought on by experiencing Patagonia with any of the five senses.
Ben linked me to the M's Capilene 4 Expedition Weight 1/4-Zip Hoody; I was instantly at full-on Pata-chub.