Flushing the toilet when there is no apparent reason to. Usually occurs while urinating, a sudden impulse to flush arises which cannot be dismissed. Afterwords impulse flushers feel confused as to why they flushed.
If you are worried about your impulse flushing you should contact your doctor, you may have Chronic impulse flushing or CIF.
Person one : Do you ever just flush the toilet for no reason?
Person two : All the time, I've got CIF
Person one : CIF?
Person two : Chronic Impulse Flushing, duhh.
Person one : Thank god I'm not alone, I think I'll go for an impulse flush right now.