The lowest, most despicable and loathsome form of self promotion, often delivered in a terse one or two fragmented sentences on social networking sites. A typical and popular approach is to use a disingenuous complaint about something, a self-deprecating statement or a comment on something completely innocuous, as a vehicle to deliver the real message, which invariably shows the person in a favourable light. In fact it shows what an attention seeking and insecure person they really are.
Humblebrag example: "Just stepped in gum. Who spits gum on the red carpet?"
Appropriate response(s): "Fuck off bitch"
Humblebrag example: "I can't believe I sounded like such a idiot on TV last night"
Appropriate response(s): "Believe it, idiot"