Someone who frequently has sex on the first date or first encounter.
Jan's friends refer to her as back- seat betty because of her many one night stands.
by mariy November 12, 2007
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A/the person standing behind you, trying to encourage you to click on a Youtube link that they want to see.
"Nooooo! Save Two Girls and A Cup for your own time, you back seat surfer!"

"Aww. I don't want to be Rick Rolled again. Quit being a back seat surfer."
by The Mar June 21, 2008
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Like 'back seat driving', back seat lifing means a more knowledgable person will want to help the stuggling person with all decisions, as they clearly have no idea of what they are doing. A back seat lifer has been there and done that many times before and just wants to pass on his immense knowledge of everything.
Man walks in holding a beer, another man back seat lifing says "don't hold it like that, it should be held like this"

Man sharpening a pencil, another man back seat lifing says "don't sharpen it like that, it should be sharpened like this"

Man standing minding his own business man back seat lifing says "don't stand there like that, you should be standing like this"
by Punter Boy February 1, 2010
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someone who looks over your shoulder as you browse the internet and tells you where to go and what links to click. An office-mate. he usually will also read the contents of your browsing.
"I was on google today shopping, but John kept back-seat browsing and telling me where to shop. what a back-seat browser"
by Coot77 May 31, 2009
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A female who gets railed in the backseat of a males locomotive. This term still stands strong if female is plowed in anytype of BACKseat, meaning: scooters, bicycles with little carriages, motorcycles. Term is picked up by female no matter status (Girlfriend, MILF, or any other female aqauitence)

ALSO KNOWN AS BASH

BAckSeatHoe
Tell me how me how the whole GOT possie railed these back seat hoe 's (BASH) so hard, they were walking like cowboys for a week!
by Carlos Gil Garcia March 21, 2007
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The person who ALWAYS has to micro-manage EVERYTHING, constantly looking over your shoulder, adding their opinions, and what they deem to be a more proficient way of doing whatever it is, added as corrections to the thing that you are doing in the right way in the first instance.
by Totes Hassles April 13, 2023
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