It's pretty obvious, but just in case: hebi (蛇) is Japanese for "snake/serpent", and hebi~ (ヘビー) is how the English word "heavy" is transliterated into Japanese phonetics.
don’t make a Delicious in Dungeon reference don’t make a Delicious in Dungeon reference don’t make a Delicious in Dungeon reference don’t make a Delicious in Dungeon reference
Uh… that Innkeeper must’ve been sad because Marcille left him.