Oh, good, it isn't just me.
I started to post something similar but stopped, thinking maybe it had some non-derogatory meaning I wasn't aware of. Maybe some people use it interchangeably with 'rug rat', 'crumb snatcher', 'ankle biter', 'curtain swinger', and other semi-affectionate nicknames for children. I've never heard 'porch monkey' used in any way other than as an insult, and primarily as a racist one.
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