This is an event which happens when you are dying to take a shit (and you know its a godzilla like turd) but there is no toilet nearby. Suddenly you are 'shocked' to find its too 'late' cause the godzilla turd is already sitting warm and toasty in your pants!
Note: 'Shock' + 'Late' forms the word Shockalate, made to sounds like chocolate, which obviously is the colour of (most) shits.
Ben: Dude are there any toilets nearby?
Bob: No man, its like 15 minutes walk past the shops.
(couple minutes later)
Ben: Damnit I just had a shockalate!