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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

If the river runs red take the dirt track instead 

If one's girlfriend is on a period one should stick one's cock up her ass instead
When a man fucks his lady up the ass because she is on her periods to avoid a bloodstained cock

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

When Your Stupid Posts Get Uploaded Instead of Your Good Ones 

STOP UNEXCEPTING MY DEFINITIONS AND UPLOADING MY STUPID ONES. Let me just say, if this gets posted I will shit myself laughing.
It's kind of self explanatory.

When Your Stupid Posts Get Uploaded Instead of Your Good Ones

Banana milkshake with salt instead of sugar 

Apparently if you make a banana milkshake with salt instead of sugar it tastes like jizz
I don’t fucking know just make a banana milkshake with salt instead of sugar because your a coward and don’t want to drink your own nutmilk like a chad
When you are dating two or more people, and feel as though you would like to have a better relationship with only one of them, you slowly spend more time with that person, but until you are sure of your relationship with them you keep the other around just in case things dont work out with the other, and you need your backup instead.
This person is your Insteady
Bob is dating Jill and Jane. He decides to take things more seriously with Jill, but keeps Jane around as his Insteady. He is now "going steady" with Jill, and insteady with Jane.
Insteady by vivera123 June 10, 2009