When someone farts just enough for only the farter to smell it, and no one else.

Similar to subsistence farming, but related to passing gas and not raising crops.
Person A: *frrt*

Person B: Did you just fart? Why don't I smell it?

Person A: I guess only I can smell it.

Person B: Thank you for subsistence farting!
by tinkarink December 12, 2021
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