This is when you've been playing loads of games/watching loads of films/TV or looking online for an incredible amount of time and you get the symptoms of a numb butt, stiffachy muscles and pins & needles in various places, a bit like when you're bed ridden in hospital or something for too long.
Ty: Is Dave gonna come with us to see the movie tonight?
Chino: Nah dude, he's got that new game.. won't see him for months!
Ty: Oh man, he's gonna be covered in Sofa Sores!
Chino: Hahah ain't that the truth!
Ty: I'm over it. Let's go.
Toki: I got us two tickets for Engine-Earz tomorrow night.
Una: woah! ...I ..I feel funny, my brain can't comprehend the sheer amount of joy Toki: heh.. feels good doesn't it?
Una: .. in so many ways! I'm numb. Hold me.
Usually used in clubs/rave/gigs when you lose control of your body due to the music and you're blissfully jumping around, flailing arms and legs about, punching the air, swaying, bumping and generally creating a wide area around you.
Yuna: Last night was a riot, I ache all over!
Blake: Oh mate, that Calyx track kicked in and you were going spastic!
Yuna: Oh, yeah, Illusions.. I lost it there a bit
Blake: Yes indeed! You made your own mosh pit!
Yuna: No regrets