The definition of a pick me up is something that cheers a person up, makes him happy or gives him more energy.
An example of a pick me up is a cup of coffee when you are tired.
- an alcoholic drink taken to raise one's spirits
- anything that stimulates, invigorates, refreshes, heartens, etc.
A drink, often an alcoholic beverage, taken as a stimulant or a cure for a hangover.