In a wider, more informal context, an allusion is a passing or casually short statement indicating broader meaning. It is an incidental mention of something, either directly or by implication, such as In the stock market he met his Waterloo..
The definition of a bump is a light jolt or a swollen, raised lump on the body. An example of a bump is the act of two toy cars hitting each other. An example of a bump is a welt on the hand. To bump is defined as to collide lightly. An example of to bump is for a car to knock gently into the back of another.
BUMP to bring up somebody's post typically by posting the word bump on a message board. Can also stand for.