also: ピッツァ · ピッツア
noun
pizza
Ordinary noun for the food. ピザ is the everyday spelling; ピッツァ may sound a little closer to the Italian pronunciation or more menu-like.
from Italian
週末に友達とピザを食べた。
I ate pizza with friends on the weekend.
この店のマルゲリータピッツァは人気がある。
This restaurant's margherita pizza is popular.
noun
fat, ugly person
Derogatory Internet slang referring insultingly to a fat or unattractive person. It is offensive and should not be used about someone.
ネットで人をピザと呼ぶのは侮辱的だ。
Calling someone piza online is insulting.
A direct derogatory word for a fat person; ピザ in this insulting sense is narrower Internet slang and is also derogatory.
A descriptive phrase meaning 'a fat person'; it is less slangy than the insulting Internet use of ピザ, though it can still sound rude depending on context.
The food word is a katakana loanword from Italian pizza. The derogatory Internet-slang sense is a later figurative use; the exact development is not specified.