1.) When somebody is giving you trouble when doing something

2.) When a race car is trying to ram you off the track when you are participating in a race, thus giving you trouble. Bubs is just a word to make it sound better

There is also a shorter version - Trubs
1.) Dave: "I really hate the apps you get on your iTouch that give me advertisment trubs in the bubs"

Chris: "Then buy the good version and stop being a jew"

2.) "The Lamborghini was giving trubs to the Porsche's bubs on the race track"
by Dinkleberry Dan December 31, 2011
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