Mastadonic 

Something excessively large. To the point that only an abnormal word can affectively describe it.

That guys cock was mastadonic on proportion to his body!

Mastadonic by L. Roman July 15, 2006

mastadonic magumbos 

1- huge boobs of mastadonic proportions
2- incredibly giant boobs
3- boobs so big, the female gracing them begins to develop a hump
4- boobs so enormus, NASA can use them as a landing space
5-tata's so large that they out-weigh a mastadon

Anna Nicole Smith has mastadonic magumbos
That spanish bitch named Charo has mastadonic magumbos

mastadonic magumbos by big willie06 July 20, 2006

anal mastadon 

a master of the art of anal sex usually working with a ginormous unit

hes known around the ladies as a regular "Anal Mastadon"

anal mastadon by z man March 10, 2005

mastadon 

an enormous penis with lots of shaft hair. often mistaken for the trunk of a woolly mammoth.

(2 guys is a locker room)

Guy 1: hey bro, why is your left leg so much harrier than your right leg?

Guy 2: dude, you are seein it from a bad angle. thats not my left leg. its my third leg.

Guy 1: whoa! thats a mastadon!

mastadon by leftlanecruzer May 14, 2011

mastodonic 

Adjective used to describe a huge, gigantic penis. Named after the mastodons, an extint species of elephants.

Synonym: elephant cock

I'm going to rape you with my mastodonic 300-mile long cock.

mastodonic by Roth Vantage January 5, 2015

mastadon 

A nickname describing a midget with an extremely large penis.

Girl 1: Hey you know peter?
Girl 2: Which one? The midget?
Girl 1: Yeah.
Girl 2: What about him?
Girl 1: He's a mastadon.
Girl 2: No Way!

mastadon by JannetTheBeast! May 30, 2008

the mastadon 

dual fisting: a sexual move consisting of the insertion of one of the males fists into each of the females holes (anus and vagina)

jamaal: dude your hands smell like shit
guunter: yea man, its cause i pulled the mastadon on susie last night

the mastadon by team mastadon January 8, 2005