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For a male penis to go from a state of softness or relaxation to a state of an uncontrollable erection in the penis.
Mainly caused by a beautiful or attractive female when seen or spotted with the eyes.

A combination of the words: Instantly (Without Delay or Immediately) and Hard (Not easily penetrated).
"Man, I just got instahard when she walked in"

"Lola Luv = Instahard"
Instahard by Vinni-V February 16, 2010
Related Words

Instahate 

When you instantaneously or spontaneously know you hate someone or something.
I was overcome with instahate the moment I saw my ex's newest conquest.

I instahated her the second our eyes met!
Instahate by justanotherposter March 28, 2011

instashade 

When you don't like an Instagram because they have already received "enough" likes. Their Instagram post is not worthy of your like. You have no more "likes" to give.
Johnny was scrolling through Instagram and realized Sally had a picture of the sky posted, with an ominous cloud. He thinks, I could have watched this on the weather channel and she has already received 89 likes, does she really need 90? Johnny throws Instashade and scrolls past, a sly smile across his face as he judges the next post.
instashade by Ryno13 October 13, 2016

Instahate 

Someone you hate on Instagram. You don't even know them in real life but still, there's this feeling of hate.
Oh you know, she's friends with that girl I instahate.
Instahate by youaremurder May 3, 2015

Instahoarder 

Someone who hoards Instagram accounts. Usually unfinished projects or exercise their different personalities..
"How many accounts do you have, punk?"
"Haha I dunno,
10 at least...
Wanna follow all 10?!
They are all separate projects which I meant to finish at some point, lol"... "Pls follow"
"You Instahoarder!"
Instahoarder by hybred August 21, 2020