Noun. A person who has little or no respect for another's personal space. Often found in lines or in traffic, these representatives get as close as possible, often well within one's personal "bubble".
Jesus! Bubble Buster Mcgee back here is 10 feet up my tail pipe! Back off asshole... (Insert liberal brake application here)
Excuse me? Bubble Buster Mcgee? Standing on top of me isn't going to get you to the ticket booth any faster...
When you are fucking a bitch in the ass doggy style and give her a good old fashion cream pie and when she attempts to blow out the jizz and it makes a bubble you smack the bubble with your cock.
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".