Basically a variation on skanking. Which was a dance you did while listening to ska or punk rock music. Skanking is usually done in a circle pit. 2-stepping is done usually during a breakdown of some hella brutal metal music. You don't go around the pit or anything. You usually just stay in once place and 2-step that shit. Hardcore dancing is sometimes referred to as "hardcore 2-stepping" or "slam dancing".
"Fuck skanking, I wanna 2-step!", "Let's 2-step at the show tonight."
FYI: I have no problem with skanking. I'd rather skank to Reel Big Fish or Rancid than hardcore dance to some crazy hardcore music.
Acronym for "Too Sad To Even Process". Typically used in text messages, but is also acceptable in everyday conversation.
Carly: My poor little chihuahua had to go to the vet because some loser from school was stalking me and he stepped on her in my back yard!
Regina: Oh my gosh! 2 STEP!
You are in the act of having sex with your wife in a hotel room and just before you blow your nut. You pull out and take two steps over to the next bed and give your sister the money shot.