A fictitious condition that is used to insult someone who's backside is straight as a board. The person the joke is about usually is wearing pants that makes them look like they have no ass at all. The person may also end up with the nickname R.A.S. - Pronounced Rass.
A date in which a queer couple, under the pretext of reading together, spend the whole nighttalking, drinking wine and cuddling, preferably reclined on a chaiselounge.
"We were going to read some books, but instead we just had a resding session."
"Are you free tonight?" "No, I'm resding with XYZ."