Weirdo on board

I saw this in a car window, a sign that seems to indicate that there is a baby on board who is wearing men's underwear. Sometimes I wish I was um, multilingual. Or at least fluent in english.

We carry the Mom's Taxi gimmick, but I thought the baby on board thing was discarded years ago as being utterly pointless.

I noticed that there was no car seat, which makes me even more curious, maybe this is some sort of gang sign.