to be viewed as weak or pathetic by your friend or group of friends for not doing as they suggest.

In extreme cases the put down can have "with skids" added to the end to emphasise the weakness/patheticness
"lets go to the pub!"
"Nah, not tonight !"
"YOU'RE GIRLS UNDIES"

extreme

"I think I am gonna pass on the pub tonight to spend time with my girl"
"YOU'RE GIRLS UNDIES... WITH SKIDS"
by Dale Kent June 21, 2008
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