What is the meaning of Come_on?

To encounter, discover; to come upon.

To appear on a stage or in a performance.

To be broadcast (through a device), or (of a broadcast) to begin playing.

To progress, to develop; to come along.

To activate; to turn on.

To show sexual or relational interest through words or sometimes actions.

To get one's period, start menstruating.

To enter the playing field.

Elaboration of come (in the sense of move towards the speaker or other focus), emphasising motion or progress, or conveying a nuance of familiarity or encouragement.

To appear or seem to be a particular.

To begin to feel the effects of a drug; to start causing effects.

To join a job, hobby or other practice.

Used other than figuratively or idiomatically: see come, on.

Come along with me; join me in going.

Synonym of let's go, a cheer or expression of support, encouragement, &c.

An expression of disbelief.

An expression of frustration, exasperation, or impatience; hurry up.

An expression of defiance or as a challenge; approach; come at me.

Source: wiktionary.org