A person with two anus's. More commonly this is caused by an untreated anal cyst which breaks the skin and creates a second passage. There is another condition called genital duplication which is known to produce a second anus in sufferers.
A friend we once had apparently suffered from an anal cyst many years ago which created him a second anal passage.
Because we had no compassion for this person at all, we decided to call him twopoo - and so it was spoken, that from that day forward that anyone with the misfortune of having two arse holes would be known as a twopoo.
a variation of one's own usual quite stable state of mind that may be upsetting for other people to experience whilst in your company, saying and doing things right out of character, swearing, shouting, blaming others, crying, unable to see reason...