Course slang for a section tilting sideways across your line of travel. There you lean your body into the turn and deliberately keep the bike upright.
On tarmac you lean bike and body into the turn together. That is exactly what tips you over on off-camber, because on loose, sideways-sloping ground the tyre lets go far sooner at a steep lean angle. So invert it: body into the turn, bike as upright as you can keep it — that leaves the maximum tyre surface on the ground rather than in the air. Load the outside pedal actively, which presses the tyre further into the surface; where it gets too tight to keep pedalling, park the outside pedal at six o'clock so it stays down without striking. The classic error is braking hard mid-section, which costs you grip and momentum at once. What often goes unnoticed: wet off-camber is the trickiest part of any cross course. On genuinely slick passages, unclip the inside foot and hold it ready. That costs a fraction of speed and prevents the entire crash.