handbrakes on

expression used to describe the desperate situation one finds oneself in when needing to unload a huge shit. It can be quantified by numbers 1, 2, or 3 according to the ammount of anal traction required to hang on before the darkening of the daks.
"so sorry can't stay to chat but my handbrakes on 3 and I've just got to unload my breakfast"
by Chris the Chef December 19, 2007
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