Top Definition
The first person you have romantic feelings for. Usually the boy/girl-next-door, that popular douche, your elder sibling's really hot friend and in some cases, your Chemistry teacher.
Boy: Hey, why are you hiding from Mr Magnesium Oxide?
Girl: SHHHHH OMg, he is my first crush!

(See that OMg there *wink**wink* Gah, I know it's MgO)
by Samantha Felicia Rose April 05, 2015
1 more definition
The first person you ever had romantic feelings for.
I killed my first crush with a brick.
by PatrickBateman1962 August 02, 2011

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