its when your feet get cold in bed and you wrap your covers around them.
wife : my feet are cold
husband : then put your bed socks on and dont steal the covers for your foot house....
This happens when you go for a poo, afterwards when all the solids have ejected and you get ready to wipe your bottom another turd starts coming out and forces you to have a two sage poo.
(Dad) OMG have you blocked the toilet again?
(Son) sorry but I had to do a two stage shit.