Pay for Pleasure.

The term probably has US origins, and is used in connection with prostitution, expecially in South East Asia. It covers all and any sexual services in return for money. This can be massages, escorts, soapies, the asia bar scene or GFE.

A term used to reference cannabis/marijuana/weed.

Picture for picture.

Points For Pageviews

A term coined on deviantART.com for the trade of an amount of points (deviantART currency) and/or actual money in return for augmentation of their profile pageviews using scripts or programs.

Sometimes this trade ranged from 100 pageviews to 1 million or more. Although the pageviews were artificial, there was no hacking involved, it was simply done using proxies.

Though dA no longer allows the sell of pageviews, the term P4P still refers to veteran P4P merchants on dA, some of which are:

Ioulaum
Rubbing
Points-4-Pageviews
PageviewLaboratory

A lot of these merchants actually gave the proceeds away to various deviants and groups, as was the main purpose for their services for most of them.

pound for pound
usually used in boxing

Plug for pussy

P4p is commonly used by the not old generations. P4p means pic for pic. For the old heads, this means picture in exchange for picture.