Logrolling

[Sarah]

The practice of defecating a large sturdy [floater], admiring said [poopsicle] and urinating on it. A well aimed healthy stream of urine causes the log to roll.

[Jason Yan]

When a reviewer or critic who gets into a tradeoff of critical praise or You scratch my back, Ill scratch yours situation. Implicitly or by agreement, one reviewer exchanges praise (often [fatuous]) with another in the hopes his inflated regard will find its way into publicity, advertising copy, [book-jacket] blurbs and the like and increase the others visibility (and sell more books). The favor is expected to be returned, and at some point is. Probably descended from the literal use of [logrolling] as a pioneer sport, in which neither participant can stay on the round, floating timber unless one is pedaling frantically one way, one the other, although the symbolism invoking a mutual-gratification pact analogous to masturbation cannot be denied.
In the 1980s, SPY magazine ran a regular column called [Logrolling] In Our Time giving exact instances of such [tit for tat].

[Marquetta]

[Masturbation]. Exclusively [masturbation] of men or boys, since [log] is another word for penis.