One who hangs around the sanitation area of a building waiting for someone to enter a cubicle so they can pop their head under and/or makestupid noises to annoy them. Once the frustrated person leaves the cubicle they will be harrased and quite likely flashed.
George Michael was a toiletduck until he got arrested by an off-duty police officer.
ToiletDuck (somebody/something) to criticize a person or organization for tagging or mentioning others in an online social media post.
The well known entrepreneur decided to toilet duck a small startup after he was tagged in a post about climate change.
She was toilet ducked by the head of media from a corporation that citing their brand should not be tagged in online posts.
He doesn’t believe that toilet ducking individuals on social media should be socially acceptable.