Puss

Slang for an octopus. Although it can be used for any member of the class Cephalopoda with an appropraite modifier e.g:
Squid = Long puss
Nautilus = Shelled puss
Ammonite = Rock puss

"Dude we are eating tonight I just got a puss from the fish monger, cheap as well"
"I can't wait to eat some puss tonight, its gonna taste so good"
"The spanish have the best puss, they just know how to prepare it"