To put things in the wrong order or with the wrong priorities. Similar to 'put the cart before the horse', but typically used for sexual situations.

Derived from the fact that a small buttplug should always be used before inserting the cock during anal sex.
Hey, Ralph, don't put the cock before the buttplug and ask those two chicks for a threesome when you just met them!
by Ron Jarvis February 18, 2011
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