1/ When a Tradie tradesperson enters their suppliers store, they generally enter through the warehouse entrance as opposed to the main (showroom) entry.

2/ The sexual innuendo of this saying, can be referred to entering a girl through the back door ass as opposed to the front entrance showroom
Bill-- Did you use the tradies entrance?

Rob -- Nah mate, did that with my ex and she didn't shit right for a week.
by Mitch-90 July 20, 2012
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