2001: It was the layback, a casual declaration of civil disobedience in the pope's living room, our own aquatic limbo act. — Jason Borte, surfline.com.
(surfing slang) the inside of a tube (ie. of a wave making a tube)
الواصلة
(surfing slang) the in·side of a tube (ie. of a wave mak·ing a tube)