I threw up bright yellow stuff, yet i stuffed myself with food. whats up?

last night, i ate alot, like a whole can of corn, 2 muffins, some steak, and then alot of cereal before going to bed. this morning, i woke up and i had really really bad stomach cramps so i went to the bathroom and i went # 2, when i finished i felt like throwing up all of a sudden, and i threw up this bright yellow phlegm type of thing, it wasnt alot but if its bile, why would it be there if my stomach was full?