It's a substitute word when in the middle of conversation and at a loss for words or to roll on with the story.
Me and this girl went to the hotel one thing lead to another Whoop da Whoop I was naked and so was she.
#2)I will meet you with the bag whoop da whoop and meet me at the spot.
Mafuguly means that a person is mutha fuckin ugly and there is no helping them.
Definition 1:Hey that old singer seal is mafugly.
#2) Dude that chick that you picked up from the bar last night is MUFUGLY.