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4.
(v) to make the penis wet, presumably for intercourse.
Sally and I were about to get busy, but I couldn't since I was dry. She used her mouth to invaginate my penis, and then we got it on.
by invaginator October 30, 2007
 
1.
Verb.
1. To enclose or become enclosed.

2. To turn or become inward.

3. To infold or become infolded so as to form a hollow space within a previously solid structure.
The larnyx ventricle conists of a large fold invaginating from the lumen.
by Belisarius March 02, 2004
 
2.
to become vagina like
that tree trunk looks like it could invaginate
by ultrajesus4000 May 08, 2006
 
3.
To take a relatively sharp implement and thrust it in a penetrating fashion into another body creating a vagina like hole.
I am going to invaginate you with this vegetable peeler and then fuck the shit out of your tiny vaginas .
by CreepyG June 02, 2010