Climbing is a sport that can be done to varying degrees of extremeness.

Bouldering, which is short un-roped climbs done over crashpads with spotters ready to protect a fall, is the simplest and least gear intensive form of climbing. While bouldering can require extreme amounts of strength and control, it is relatively safe, because the only danger comes from landing incorrectly

Top-roping is the form of climbing most commonly thought about when someone hears the word "rock climbing" it involves the rope going up from the climber, through an anchor setup at the top of the climb, and back down to the belayer. it is the safest, and best kind of climbing for beginners, because the potential for long falls is almost completely eliminated.

Sport climbing is done by climbers who "lead" up rocks that are pre-drilled with bolts. Climbers clip "draws" into the bolts then clip the rope through the draw. More dangerous than toproping because when you fall, you fall twice the distance between you and the last bolt. Lead climbing is the only recognized form of "true" ascents.

Trad climbing, or "traditional" climbing is the origional kind of climbing. It starts with the climbers and their gear that the bottom of a cliff, and then they go up, the leader fixes placements, then the second follows and "cleans" the gear, or removes it from the rock. Very difficult climbing due to the fact that one has to place gear with one hand while hanging on to the rock with the other. Requires large amounts of gear and a lot of technical knowledge.

Unfortunately there are many wanna be climbers out there who talk like they are hardcore people but they wouldn't know an ATC from a Reverso, or Petzl from Black Diamond.
Real climbers climb because they love the rock, not for chicks or props or crap like that.

v.
when a woman engages in various sexual positions where she is atop the man

Ill, awesome, or dope.

Can also be used in the form "climbatic" which is a reference to Illmatic.

Slowly moving your hand up someone else’s thigh

When someone, mainly someone who is romanticly or sexually interested in you, goes above and bond to win you over or impress you. So they can go out with you.
However, if you're significant other "climbs" for you, it means that they have done something bad and are trying to win you back or make up for something.

Going to smoke the wacky backy.

An attempt by one to, unwarrantedly, contribute to a personal joke, conversation or otherwise. Most commonly associated to those seeking to gain popularity with relative groups through association.

when you find a random image/blog/person on the internet and trace it to its original source and begin to monitor it daily/weekly.

It's two bros who ocassionaly fuck called Chris and Josh, from Until Dawn.