Nesting

Defined on ABOheadcanons (A/B/O, Alpha/Beta/Omega), Nesting is more of a softer action where an Omega takes things that make them comfortable and surround them-self with it during heat. This could be something that smells like their partner, or it could be something that calms the Omega. Usually, things found in nests are soft.

Person A: "It was so cute, my Omega was Nesting last night."

Tail Rider

Also known as Tail-Riders, Tail Riders are THE MOST annoying types of PvPers when it comes to creature survival games. Such as The Isle, Beasts of Bermuda, Era of Terror, Creatures of Sonaria, etc. Basically, any game with PvP where you have a tail or a wide range turn, Tail Riders are there.

Tail Riders are so bad mainly because they stay right on your rear end during PvP, limiting most creatures or characters from attacking back because of turn radius. They make sure it's near impossible to attack them, because they're SO BAD at PvP. That, or they're trolling because they have nothing better to do with their life.

Person A: "I quit!"
Person B: "Why? This is such a great game."
Person A: "Every time I try to grow something, I'm KOSed by a Tail Rider."

Rexed

Rexed means being so upset or pissed off you could kill anything.

Person 1: "God damn it! My boyfriend spoiled Incredibles 2 for me! Im so Rexed!"