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1.
A mature man with a cock smaller than a young boys - generally under 3" soft and 5" fully erect. Tiny cocks should never be allowed inside any woman's pussy unless she is totally wasted.
Jill husband doug's tiny cock (1 inch soft, 3.2 inch hard) is totally useless and unfuckable by any woman. As a level 3 cuckold doug - is NEVER PERMITTED inside her pussy OR any other woman. Jill requires him to wear women's panties as an unmistakeable message to anyone that his tiny little boy cock does not deserve to be in a real man's undies.
by Jills cuckold doug June 20, 2006
 
2.
A man with an erect penile length of at least 2.5 standard deviations smaller than the mean human penis size, or smaller than about 7 cm (2 3 4 in) for an adult when compared to an average erection of 12.5 cm (6 in). When witnessed by women, it is typically laughed at.
Girl 1: So Brandon took me home last night, and we were gonna have sex, but he had a tiny cock!
Girl 2: Oh, that poor thing!
Girl 1: Yeah, I just laughed and told him to go home.
by Batman_187 June 19, 2014