They've been trying to work/get the 'bugs' out of the system. [=trying to fix the system's problems]
He was first bitten by 'the' acting 'bug' [=he first became interested in acting] when he was 18.
Her legs were covered in 'bug' bites. [=itchy or painful wounds from insects]
(..) this young man. Okay. Good night, Daddy. Good night. Oh, boy. This bug goes "Daddy, I don't understand." He goes, "Well, in theory, we're both millionaires, but in reality, we live with a bunch of whores." (..)2004 The Notebook