A very gassy, extended fart when in a confined space and the wind has nowhere to escape, for example when sitting on a chair or under the covers in a bed. It derives from the stacking up of the gases, which the culprit is desperate not to disturb and the subsequent stacking up of guilt as s/he knows it's only a matter of time before s/he's discovered.
A: Somebody stacked. B stop stacking!
B: I didn't. It was C. He stacked under the covers. I felt the whole bed vibrate.
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