The name of a session in which the chaps gather to binge on carbonated drinks, usually riddled with extraordinary amounts of caffeine. Activities to take place on a calvino sesh may include; pegging it round the local park at 4am, refusing to sleep, aimlessly gaming on almost every single game on the hosts console, eating horrifically cheap and super tasty sugary snacks, etc.
Calvin:Mom's not feeling well, so I'm going to make her a get well card.
Hobbes:That's thoughtful of you
Calvin:See, on the front it says 'Get well soon, and on the inside it says because my bed isn't made, my clothes need to be put away, and I'm hungry. Love Calvin.' Want to sign it?
Hobbes:Sure, I'm hungry too.
Kickass monster fixated, transmorgifier time travel machine, boy and imaginary tuna-loving tiger adventures with most excellent art from Bill Waterson's brain.