In message board lingo, this term is used to describe a poster (user) who is 'late' in a response to a certain topic, primarily in reference to the ever-popular "Person Above You" thread, where there is a possibility that numerous users are posting simultaneously.
A joint that is rolled so inaccurately that most of the weed is cornered in one section of a joint.
"Jenna, seriously? You rolled another pregnant. Stop while you're at it."
"Dude, why the pregnant again?! I'll do it this time with your crappy joint skills."
When a joint has not been shaped ( the matirial in the joint is nicely even ) OR when you havent grinded a bud ( of weed ) and it creats, once rolled, i sort of pregnant look, like a small bubble in a pen
you didnt even grind it you idiot now it looks all pregnant