When one is afflicted by food poisoning or 'the shits', and you are confined to staying on the toilet producing inhuman quantities of faecal matter for up to several days.
I.E. "Ride the thunderbucket"
"Something in that burrito didn't go down well... had to ride the Thunderbucket all night last night!"
"If I eat that i'll definatly have to ride the thunderbucket."
When someone pours a bucket of water on someone as they are defacating, soaking them and their toilet paper. Works best in open roofed stalls.
"Hey Ben is taking a dump, lets go thunderbucket him."