I seriously didn’t know what a camel toe was until my teenage son’s friends and he were in the barn playing cards and I over heard them talking about some girl at school who had a camel toe. I had to ask my husband. I went to Catholic elementary and then all girls High School. This was around 2003 when he was a senior in high school-and we had lived in small country town.
You should have asked your son. His buddies would have enjoyed that.
We all may not know nor be able to recognize each different group's slang ( and every group you can think of, has words or phrases that are primarily there's alone, until it somehow ( usually through music/lyrics ) it becomes part of the common parlance.
Such slang can be used by certain social and/or economic social strata, region, and yes, even racial and ethnic groups. There has always been some sort of slang used by criminals, ethnic minority groups ( Cockney rhyming slang falls into both of those groups ), the kind of school/s one goes to, hobbyists, and/or professions/careers/jobs.