Fred Flintstone 

To date two or more girls simultaneously. This refers to the 1/19/62 Flintstones episode #44 "The Entertainer" when Fred has to manage two dates at the same club when Wilma unexpectedly shows up. Of course, he had the help of Barney to distract them as he switches between girls (this will not always be your case). Even though he was ultimately unsuccessful, the expression remains.

Man, I forgot about Caroline and invited Audrey out too... I can't cancel now, I'll have to pull a Fred Flintstone.

Fred Flintstone by FredFlintstone January 13, 2009

Fred Flinstone Gift 

This means a type of gift (usually from a husband to his wife) that was bought for his use, and her birthday, Christmas, etc. was a scapegoat for it.

A man may buy his wife a fishing rod for her birthday, and when she says she would never use it he jumps on the chance to use it for himself...this is a classic Fred Flinstone Gift.

Fred Flinstone Gift by downtownchick September 7, 2010

fred flinstone this bitch 

when there is any sirens around you and you are on a moped going up a hill going so slow that you could push it faster.

(david) o shit popo tanner fred flinstone this bitch.

fred flinstone this bitch by tanner newbergh December 15, 2008

fred flintstone 

i'll explain in this

seeing as i'm fred flintstone, i can make your bed ROCK!

fred flintstone by www July 2, 2003

Fred Flintstone 

a very short "stubble" beard around 8-12 hours old.

see 5:00 shadow

I have to shave twice a day; otherwise I'll have a Fred Flintstone by 9PM.

Fred Flintstone by BJT9000 January 8, 2003

Fred Flintstone 

A man pitifully out of touch with modern life, especially with how to treat his significant other.

Fat Lazy Piece of Crap-Get me a beer and and make me a sandwich!
Chick who Goes with Him-Go get them yourself, you fat tub of goo! I'm busy!

Fred Flintstone by Shawn B. April 30, 2003

Fred Flintstone 

Going down on a woman while she is on her period; coming up Fred Flintstone faced.

His face was two-toned like Fred Flintstone after that unfortunate encounter.

Fred Flintstone by Gison April 13, 2010