A combination of the words "impregnated" and "in cognito" devised by myself.
Literally: a woman who is pregant and trying to hide it by means of wearing baggy, unflattering clothing, or by claiming that she has simply "gained a few pounds."
"Yeah, she impregnito."
"Bitch, you ain't fat, you impregnito"
"Check that trashy slut out, she's what you call impregnito"