can be used to describe a nasty woman's genitalia, as in mold found in a nasty bathroom or kitchen,
can also be used as a question to let others around know the person is being moody for reasons not caused or involved with the much like how one may ask if you have sand in your vagina. using the phrase this way works on both male and female partys
EXAMPLE 1.
Guy one: No way I'd hit that!
Guy two: I know right I bet she has mold on her Petunia
EXAMPLE 2.
The man at the post office was a real jerk today; I asked him whats your deal do you have Mold on your petunia?
a metaphor for human civilization sprouting on a substrate (earth's surface). when viewed from atop a mountain or from a plane the city lights and man made structures seem similar to mold growing on bread. at night all u can see is the flickering of thousands of lights, not individual human beings. Joe rogan explains this in great detail in his youtube video about the psychedelic DMT.
Looking at all the mold on bread from the top of Iron mountain in san diego makes me think that we're nothing but shadows and dust.
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.