a- act of affection performed by touching one's lips to something
b- Response given when someone is complaining about your behaviour or performance. Used sarcastically to show how little you actually care.
"give me kisses..."
disgruntled video gamer: "Man f u animal mother you get me every effing time!"
boss: "Tom, I am really dissappointed in your work ethic this month and wish you would stop playing video goames while on the job. Do we have an understanding?"