When one flushes the toilet while sitting on it causing the water to cleanse their ass like a bidet would do. For maximum efficiency it is recommended that one should dip their ass slightly into the bowl of the toilet, thus splashing more water between the cheeks.
When making use of the ghetto bidet one should make sure the toilet is empty. You do not want a cold wave of piss showering your anus.
af TKFT 9. januar 2013