What does the joke: "Q: What do you get when you turn 3 blondes upside down? A: 2

[Rollo]

brunettes" Mean? I dont get the joke

 

[David L]

one day you will

 

[Staggerlee]

2 out of three blondes are really brunettes with bleached hair
in hte joke if you turn them upside down you see their pubic hair and 2 of those 3 blondes pubes are going to be brunette because no women really bleach their pubic hair

 

[Ken]

it means they are not true blondes