dirty bulk
/ˈdɜːrti bʌlk/
CommonEating in a large calorie surplus from any food source to maximize muscle and strength gains, accepting significant fat gain.
Some lifters swear by it for strength gains. Others view it as undisciplined. Often used humorously or self-deprecatingly.
Real-world examples4 examples
| # | Example | What it means | Source |
|---|---|---|---|
| 01 | in full dirty bulk mode. ate an entire pizza after the gym and I'm not even sorry | The person is fully committed to eating whatever they want during a mass-gaining phase. | instagram, 2024 |
| 02 | dirty bulked for 6 months and added 40 lbs to my squat. also added 20 lbs of fat. worth it? | Sharing the tradeoff of significant strength gain paired with unwanted fat gain. | reddit, 2023 |
| 03 | bro asked if I was on a clean bulk. nah fam. McDonald's twice a day. dirty bulk szn | Confirming a lack of dietary restrictions during a bulk. | x, 2024 |
| 04 | started a dirty bulk in october. by january I looked pregnant. never again | The person gained too much fat from an aggressive dirty bulk and regretted it. | reddit, 2023 |
Use it when
- Someone is eating anything and everything to hit a high calorie target.
- Someone prioritizes scale weight and strength over staying lean.
- Joking about eating fast food or junk food and calling it gains.
- Describing a period of intentional overeating without food restrictions.
Do not use it when
- You mean careful, controlled eating to build muscle.Use “clean-bulk” instead.
- You just mean overeating without any fitness goal.
Variations and related forms
Dirty bulk vs clean bulk
dirty bulk
Dirty bulk accepts fat gain in exchange for faster weight and strength gains.
VS
clean-bulk
Clean bulk limits fat gain by keeping food quality high and surplus moderate.
Origin and context
Developed in bodybuilding culture as the aggressive counterpart to clean bulking. Became widely used in online fitness communities from the 2000s onward.
- First seen
- 2000s
- Confidence
- medium
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https://slang.fyi/dirty-bulkUpdated: 2026-08-28License: CC BY 4.0