A timid man who is nearly always staring at womens' breasts, but just can't work up the nerve to speak to one.
"Bek, button a button. You have a titmouse at ten o'clock," Cherry said, tucking a scarf into the front of her dress to discourage the creepy little man.
by bIrqul May 10, 2012
Top Definition
Small, invisible rodent that leads what one imagines is an idyllic existence in the ample cleavage of beautiful ladies.
Gordon: I'd love to be Nigella Lawson's titmouse.
by Citizen Sade March 14, 2008
A titmouse is a very small insectivorous bird that come from the family Paridae and are only found in the northen hemisphere and Africa.
The name titmouse is attested from the 14th century, composed of the Old English name for the bird, mase (Proto-Germanic *maison) and tit, denoting something small. The spelling was influenced by mouse in the 16th century.
"What the hell is that on my window ledge?"
"Don't worry dude, chill, its just a titmouse."
by Matt[O] September 10, 2005
1. A person with an extreme sexual fixation or preference for large breasts.

2. A man who focuses on the breasts during sex. A Mammaphiliac.

see also: tit fiend.
"Joe would live in her cleavage if he could. He is a total titmouse."
by NihilistDom August 24, 2009
Small Northamerican song bird.
The other day I was hunting in my backyard and shot a titmouse right out of the tree!
by Farcus Prime August 18, 2005
A mouse with gigantic tits. A mouse is a small, brown, furry rodent - this type has a large pair of human breasts on it's chest (think Pamela Anderson meets Mrs Frisby).
Look at the rack on that tit mouse.
by Jonny mouseman January 15, 2010
A bird referenced as something with a short term memory.
"She has the memory of a titmouse." "Sorry, I totally blanked; I have the memory of a titmouse today."
by M.L. Faire June 22, 2015
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