When someone remembers all of your mistakes, almost like picking up grains of sand and putting them in the bag. Then when they want to put people against you, they remind you of all of their mistakes, as if they were hitting you with the bag of sand.
Sheila: Shelly you're so full of crap.

Shelly: says the one who got mad at me on my birthday two years ago.
Sheila: what does that have to do with anything. Stop sandbagging me.
by Mlimbach610 August 03, 2016

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In Sales; the act of intentionally holding back deals till the next month to get off to a fast start. Stems from the belief that you can't perform to a high level without a competitive advantage. See also: Mental Weakness.
"Can you believe Jeff is sandbagging 72 deals so he can make May's numbers look better?"
by Lyle Carson May 23, 2016

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To pretend to suck at Mario Kart 64 to get good items.
You're sandbagging again. Major sandbagging.
by Raccoonius February 01, 2015

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When someone talks almost endlessly about their past military experiences, including historical facts, anecdotes and tales of buffoonery. It is possible to be caught in a conversation with a group of sandbaggers, this can be a dangerously boring situation, difficult to get away from and should be avoided by civilians at all costs.
Tony: "Tim, did I ever tell you about the Naval Commander that invented the jubilee clip?"

Tim: "What the f**k has that got to do with anything? Don't start sandbagging!"
by xpanda1982 June 21, 2011

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In gaming, the act of slowly leveling while otherwise increasing stats and currency in order to be stronger than other players at your same level; who have not sandbagged. Particularly useful in pvp focused games that pair players based on level.
After spending months sandbagging I become the strongest player in my tier.
by Gr1pp717 September 09, 2012

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The deliberate act of matching speed with a car or truck beside you on the freeway, thereby preventing the d-bag behind you from proceeding with his 90 mph freeway surfing ways.

An amusing road trip past-time.

The intentional, and often hilarious, mischievous brother of the speed limit demon.

Also the same general premise of freeway tag, just without the presence of people you actually like.
1. "You, me, a semi, and the speed limit... Let's all get to know each other, shall we?. Let the sand-bagging begin..."

2. "Ah, flashed your brights.. that's gonna cost you another 30 seconds of sand-bagging, my friend.."
by Road_Man January 22, 2010

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The act of "sandbagging" includes, preventing a person(s) from doing a certian activity. Sandbagging also includes hastling a person.
Zac: Get Off The Road Donald!
Donald: Dont you be sandbagging me bud!
by DonaldBudMurrayBud June 22, 2010

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