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From "homunculus" which means "perfectly formed miniature human being", which you should infer this means a nondeformed penislike object too small to be considered a penis at first glance.

Sounds likes "humungous penis" in some dialects which confuses some frat boys who think saying they have a "homuncupenis" is an awesome pick up line when delivered in the "humungous" sounding manner. However, it still means tiny.
James from ΣΧ was trying to brag about his homuncupenis to Jane the GDI, first time a frat boy ever made her laugh. First time he ever made a girl laugh, without whipping it out.
by omfgireallydontcare July 10, 2016
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