Explanation of OOP

OOP is a simply an acronym that stands for “out of position”. Being “out of position” means to act first on each betting round. Being out of position is considered to be a disadvantage since the out of position player does not get to see what his opponent does before acting on each street.

See the glossary entry under position for a full breakdown on the topic.

Example of OOP being used in a sentence -> Generally we should look to fold more frequently when OOP since it’s harder to play a wide range of hands profitably. 

See Also 

Position, Button, Big Blind, Small Blind, Cutoff, Hijack