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When you upload an image onto the social networking app Instagram, and you proceed to get many likes on the picture, hopefully from many great looking dimes and slampieces to insure maximal domage and increasing the growth of ones social ego.
"Avery how many likes did you get on that picture of the sky with the Camera+ HDR effect on it?"

"Dood I got like 53!!!"

"Damn dood thats mad instadome"
by SaulSilver November 18, 2012
Refers to when something is so badass or sexy that simply having it or wearing it will get you free sex from anyone. Think like axe body spray, only legit.
...dude that wicked new justice belt is pure insta-dome dude!
by Jeff Simonson August 04, 2007