He probably deliberately obscured "bug" to sound like fuck because I admit I thought he said fuck at first as well. You're also aware that Gene Vincent was tried in absentia, I believe, I Virginny--his home state--because in "Woman Love" he supposedly says the verse, "I'm lookin' for a woman with a one-track mind a-huggin' and a-squeezing' and a-smoochin' all the time" actually contained the f-word. He seems to deliberately work a pseudo-"F" sound just before he sings "huggin'" so that it sounds like "a-fuggin'". Give it a listen. So Marvin tried the same thing. A little racy publicity never hurts.