To be under the effects of adderall.

Etymology: This word developed from the phrase "Ride the white horse." which is in reference to cocaine use, and came to popularity in the 70s. The similar stimulant effects of adderall have caused the effects of these two substances to be considered in some ways related.
I got to do well on this test, man. I'm about to ride the orange horse through this study session!
by CoreyD123 August 17, 2008
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Rhythmically thrusting one's erect penis into the mouth of a horizontal lady whilst straddling her face (said lady is ideally less than 5'1" in height).
I met this girl on hinge and was riding the tiny horse before I knew it.
by Stormplum June 22, 2021
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A more polite way of saying you are taking a shit
A wife is calling her husband over the cell phone.
- Hello, darling! Where are you? I've checked the whole house and you're nowhere to be seen.
- Check the bathroom - I'm riding a white horse.
- Why are you so long there?
- I'm having a shy one. Tryin' to pinch one off.
by Murdoc Kylburne February 11, 2018
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