When just putting the ecstasy pills in your mouth and swallowing them isn't enough for you anymore you would "fizzy bum drop" or stick them up your bum bum and let them fizz away! make sure ya make it past the shelf though.
George: So i just walked into the bathroom and there he was with his hand up his arse with a pill on the end of his finger!
The act of placing an ecstacy tablet in the anal cavity and proceeding to drop to the floor with force as to make the tablet enter the anus. Guaranteed 15% extra buzz!