A man who's penis is smaller than most... Big enough to feel, yet small enough to never hurt.
The first person I had sex wiTh was Cory, but Daniel popped my cherry.

Damian: How big is Cory's dick
Rick: Ughe, Well he is fun sized
by Motherfkrrrr September 5, 2016
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Fun size - Sitting height for physical compatability purposes.

Eg1..๐Ÿง˜ โ™‚๏ธ84 +๐Ÿง˜ โ™€๏ธ104 = ( . )๐Ÿ™„( . )

Eg2..๐Ÿง˜ โ™‚๏ธ84 +๐Ÿง˜ โ™€๏ธ80 = It's a match! ๐Ÿ’‹
Eg3..๐Ÿง˜ โ™‚๏ธ110 +๐Ÿง˜ โ™€๏ธ104 = It's a match! ๐Ÿ’‹
Eg4.. ๐Ÿง˜ โ™‚๏ธ110 +๐Ÿง˜ โ™€๏ธ80 = it's your daughter?
Height matters for ๐ŸŽ Are you a horse? โ™‹..Think about it.. It's lots more fun when your body sizes match.

What's your ๐Ÿง˜ โ™€๏ธ fun size?
by Sayithowyouseeit March 19, 2021
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When a female is at the specific height were she can perform oral sex on you without having to get on her knees or squat down while both of you are standing.
Tim: Wow I just got a blowhob and she didnt even have to get on her knees!

Jake: Dude, she was fun sized
by Duphuc January 10, 2019
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A girl who is a great artist, and friend. Her short height is where her nickname comes from. One of my good friends.
Guy#1: wow, who drew that? It's amazing!
Guy#2: Fun-size did.

Guy#1: all right everyone, time to come up with nicknames.
Guy#2: she's short, she should be Fun-size.
by Dumbles June 20, 2013
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Having a penis that is in the small category. All though it is called "fun" sized it is not something to be proud of because the fun does not refer to the intercourse it is a joke on the fun size candy bars. DO NOT TELL SOMEONE YOU HAVE A FUN-SIZED PENIS.
I was at a party with zack and we got intimate, i was turned off because his penis was only a fun size
by SNAVETREBOR November 3, 2011
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