ever go into a black naborhood? all the niggas are on the porch! a porch nigga is the black person who breaks out the 50 year old lawn chair, and just sits on thier porch all day. hence the name, porch nigga
"oh look niggas on the porch!" "look at the porch niggas" "theres one...and another!...niggas on the porch...porch niggas!"
this can be said when someone, or you, is in a state of utter confusion. your are so fuckin confused, you blurt out some random phrase to show how god damn fucked up u are.
"god damit you baffle me backwards wastin plates and shit!"