Bulldog Piss Nettle
In refeference to an ugly person. Their face is said to look like a bulldog licking piss of a nettle. For short hand the words BPN may be referred to.
For example "Hey that girl is hideous."
"Yer what a BPN(Bulldog Piss Nettle)!"
"Yer what a BPN(Bulldog Piss Nettle)!"