to be sneaky and quiet.

synonyms include: wily, cat-like.
Lauren: let's put some grass in Kelly's hair!!!

Aimee: Okay, but we have to be stealthy.
(they sneak up quietly behind Kelly and put grass in her hair)

Kelly: why is there grass in my hair?!! Ohhhhh...... you two are very stealthy.
by Maudington July 8, 2009
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A secretly taken photograph
A: I finally took a pic of my girl! Here Shows pic
B: Why she lookin' away?
A: It's a stealthie! She don't know I took that
by StealthNinja February 15, 2015
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dane joella-like

the quality of being able to exit a room in a college dormitory without notice by emily smith.
dane stealthily exited room 422 while emily sat on sarah's bed.
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when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.

This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"

FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"
by gwenhyfar September 26, 2016
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a skateboarding term for cleanliness after a clean trick is landed.
making everyone silent after the trick is landed, hence, STEALTHY
Damn did you see Nile Gibbs land that stealthy ass nollie lazer flip
by PJ E. Ladd January 9, 2009
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When your mate secretly naps and turns off all communications.
"Where's Ray? He's not answering his phone.. He must be doing stealthys"
by MrKman1 May 26, 2012
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a selfie taken for the purpose of photographing whatever is behind you
"I saw that chick from Pretty Little Liars in Starbucks! Check out this stealthie I got of her being snippy with the barista."
by actionjacksonlovesbbq November 20, 2013
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