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Rip Rocked
Getting a second wind while surfing; a refreshed feeling.

Rip Tide
Ocean flow characterized by strong out-flowing current.

Ripper
Someone who rips or shreds at surfing. Someone who surfs exceptionally well.

River Mouth
A wave that forms on the sediments deposited at a river mouth. Similar to beach breaks but sometimes more
susceptible to being sectiony.

Ripping
Executing drastic and radical moves on the wave. Having it your way with a wave.

Rocker

The curve of the surfboard bottom from nose to tail viewed from the side. Probably the single most important factor in surfboard design, because it controls the general flow of water from its entry (where water first contacts the bottom) to its release (where water leaves the board). Generally, a surfboard with more tail rocker will turn easier but might be a little slower, while a surfboard with less tail rocker will turn harder but might be a little faster. The difficulty of hand shaping an evenly balanced rocker is legendary among shapers, but has largely been relieved by improved blank technology and the use of computer shaping machines.

Roller Coaster
A series of linked turns up and down the wave face, while maintaining the same cut direction (heading to the right
or left on a wave).

Rolling Down the Windows
To flail one one's arms when off balance in an attempt to avoid an impending wipeout.

Room
Inside the barrel or Green Room.

Roonies
  Negative effect of spending copious amounts of time away from the beach; at school, the dentist, doctor, etc.

Roundhouse cutback
A complete 180-degree directional change in which the surfer turns from the shoulder all the way back into the curl or whitewater of the breaking wave, before completing the ride. A very advanced maneuver, which is difficult to complete if enough speed isn't carried throughout the entire 180-degree turn. A roundhouse cutback is usually complemented by a foam bounce recovery off the approaching whitewater.

Round tail
A tail shape in which the two sides of the board come together in smooth curves to form a semicircle. The round tail is a neutral tail shape, not resisting or adding to any turn.

Rubber arms
The feeling of very weak arms after a lot of paddling. Beginners will often feel "rubber arms" until they build up paddling muscles in their shoulder and arms. Advanced surfers may feel rubber arms after multiple hours of intense paddling. Also called "noodled".

Rubbered
The condition of a surfer after having completed a day long session.

Runoff
Often referred to as urban runoff, storm water runoff and non-point source pollution, this type of pollution is rain and river water that collects land-based contaminants and flushes them down to the beach.