English Slang collection：
[例] Tim's bummed out. He got kicked out of the company.;
[释] an unpleasant or disappointing experience;
[例] A: Do you still remember our last trip to Thailand? B: Oh... You can forget it. It's a totally a bummer.
[释] a vagrant or idler;
[例] The bummers have caused serious problems. The government has promised to take actions.;
bum something from someone
[释] to beg/borrow from someone;
[例] Can I bum some money off you? I left my wallet in the car.
[释] full of people;
[例] The party is bumping! There's a number of faces that I don't know at all.;
bump in the road
[释] difficulty; hardship;
[例] Apple Inc hit a rare bump in the road after the death of Steve Jobs though Cook was trying hard.