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1.
Breast fucking. (Japanese)
paizuri wa sugoi! (Breast fucking is great!)
Looks at the knockers on that one, she'd be nice for some paizuri.
by Klarth October 18, 2002
 
2.
Paizuri is a subcategory of hentai that involves 'breast sex', also known in America and other parts of the world (slang) as 'titty fucking', 'tit fucking', etc.

When Paizuri first became a big thing in hentai, it was most commonplace for the character giving paizuri to the second party to have large or huge breasts. However, in the past few years or so, this has become more varied. In many types of hentai, women of all breast sizes can give paizuri.

Some varieties: Double paizuri (involving two women performing it on a single penis), multi paizuri (same as double but involving more women), clothed paizuri, futa (she-male) paizuri, etc...
Eric: I picked up a few new Vocaloid doujins from Sakura-Con a few days ago.

Jay: Any good?

Eric: Yeah, a lot of paizuri.

Jay: Teh titz!
by Dr. Dick Delaware August 31, 2011
 
3.
A japanese term for titty sex. It comes from opai which means titty in Japanese, and zuri meaning sex.
Jerry squeezed Tomokos breast together and pai zuried her like crazy.
by David in Tokyo July 11, 2006
 
4.
In essence, breast sex. It is a Japanese word, but is used commonly by Otakus that are total perverts and actually looked up the Japanese word for tit fucking.
Paizuri wa sugoi! (Breast fucking is great!)
I hope I can get my large chested girlfriend to give me paizuri.
Why don't you go paizuri yourself?
by ZeroVirus January 26, 2005