Preninjaing 

When someone in trade posts that they are 'reserving' an item for themselves usually used in World of Warcraft. This 'reserving' is just them telling you they are going to preninja it.
Started on the realm Windrunner where all shit is holy.

Kyzykystyqys planned on preninjaing the Black Drake mount from 10 man OS 3d

Preninjaing by WindrunnerRealms December 27, 2009

greninjaing 

Greninjaing is when someone wraps their tongue around your V in some way.

Is it just me or has matt benn greninjaing you recently?
"Yeah, i wish he would stop"

greninjaing by A random person 23.0 November 3, 2013