When someone uses the bathroom and uses almost or all of the toliet paper with out replacing it.
Dude (In the bathroom) Do you think you can get me some TP, Someone just sandbagged me!

That sandbagging son of a B1tch!
by Shay 5 April 6, 2009
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Sandbagging (or being a Sandbagger) is the act of participating in an event or competition you are clearly the best at a particular activity, and thereby win easily due to your skill level.

Likely origin is from BMX racing in the early 90s where the term was used often.
"Tom entered the race as a novice. That's ridiculous."
"I swear he's been racing for 10+ years."
"Yeah. He's totally sandbagging."
by milesandwine January 24, 2016
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(Sandbagger, Sandbagged)

The act of deliberately putting obstacles into someone else's path as a deterrent.

Being "sandbagged" can also be a way of describing being completely taken for surprise, or blind-sided.
A deer got loose on the motorcross track and ended up sandbagging a few of the riders.

That guy got sandbagged right when he turned the corner.
by Dutch Thompinson May 23, 2020
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In ham radio and CB radio, sandbagging is listening to a frequency without participating.
"Careful what you say on Channel 19, the RCMP is always sandbagging there."

"Okay, nice talking to you, I'll probably be sandbagging for the next hour in case you want me."
by Janey Canuck November 25, 2019
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Intentionally withholding information (including not doing your best at an activity) in order to surprise someone later.

Examples:
- "Check-raise" in poker (showing weakness despite to encourage someone else betting, knowing you likely have a superior hand). Also known as "slow-playing."
- Implying that you have bad news, then revealing good news
Chuck made a sad face. "I have bad news," he said. After a pause, he broke into a grin. "Just kidding - I got the job! I was sandbagging you."

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Jen checked on the flop and turn, then went all-in on the river. It turned out she had flopped a full house and was sandbagging until the river.
by JoshAllover January 11, 2018
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In racing, placing bags of sand in your car or on your horse during qualifying to add weight this slow them down to earn them a better position in qualifying.
Steve's got the pole position, everyone knows he was sandbagging.
by J. Cloud, N. October 13, 2018
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