Top Definition
a phase in which the male sex organ know as the penis, or cock, becomes some what aroused but has yet to become a full hard on erection. Also known as half staff.
dude she stuck her hand down my drawers nd i had an iffy-stiffy nd she got scared away!
by Zachs January 08, 2005
1 more definition
When you are half turned on but also half not.
Jeremy: Dude, in class last period I got an Iffy Stiffy because of the sub.

James: Yeah me too...
by balboni October 01, 2014

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