Someone who has blonde public hair, could be used as an insult, or just a simple saying; spawned from firecrotch
“christina aguilera is a dirty lemoncrotch”
“Brandy has a firecrotch, while I have a lemoncrotch and Sally has a cococrotch”
lemoncrotch: define #2
Just like the word firecrotch is used to describe gingers, lemoncrotch is used to describe a person with very blonde hair.
Look at Christian over there. He is most definitely a lemoncrotch.