A girl in a lesbian relationship who is usually a bottom. She likes to recieve rather than give and she is also most likely to stop texting when she sees you're also typing.

the thing that you don’t have when you’re phones percentage is over 20

This usually has a negative connotation. In some situations it is an act of laziness but in others it is a girl who lays back and is willing take whatever her partner wants to give her. In this case it is a submissive partner that is willing to give all the control to her dominant partner. Normally this type of relationship is a mutual agreement so that both are getting what they want.

A girl who lays back on a pillow during sex being pleasured but doing nothing in return.

the ultimate sub lesbian. they will literally lay there whilst their partner does all the work.

(1) A girl (of any sexuality) who likes to receive sexual pleasure, but does not often return the favor herself.
(2) A (usually humorous, often self-deprecating) term to refer to a gay man who almost always prefers to be the bottom, and often is fairly lazy/self-serving about it.

Both definitions stem from the idea that they just want to lay back on the pillow and be treated like a princess.

A woman, usually in a of a curious/bisexual context, who wants to experience pleasure from oral sex, but who is unwilling to reciprocate.