Washing only the most inimate portions of the anatomy in the hand basin, as opposed to a shower or full bath. Name derived from the british tradition of avoidaing becoming cold by fully declothing and getting wet in a cold climate. Also a time saving measure.
I was running late for work so I had a pommie wash and splashed on a bit more aftershave.
When you walk into the bathroom right after someone who made a ..... well let's just say a "stinky" and you get blamed for his/her mistake by the next person entering into the bathroom.
Johnny first experienced "poomiliation" at the age of 16 upon entering into the restroom at a fancy restaurant after the man before him had enjoyed his baked beans a little too much. The man in line behind Johnny handed him a bottle of Bean-O and told him to be on his way.