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1. To give someone a slap on some part of their body. In this usage, a noun or pronoun is used between "slap" and "on." I slapped him on the back trying to get him to cough up the food.
2. To present someone with a legal notice, citation, or indictment. In this usage, a noun or pronoun is used between "slap" and "on." He slapped a speeding ticket on me just for going a few miles above the speed limit. The landlord just slapped an eviction notice on us.
3. To apply something to oneself or something else very hastily or haphazardly. In this usage, a noun or pronoun can be used between "slap" and "on." I just need to slap on something to wear and I'll be ready to go. Don't just slap your makeup on like that—you need to learn how to put it on properly. I can't understand why this artist is so revered. It looks like he just slapped paint on the canvas and left it at that.
slap someone on something
to slap a particular part of someone. Gerald was always slapping his friends on the back. He slapped himself on the knee and laughed very loudly.
slap something on someone
Inf. to serve someone with a legal paper or citation. The strange man came into the office and slapped a subpoena on Mary. I will slap a citation on you for speeding if you don't stop arguing.
slap something on
1. Inf. to dress in something hastily. Henry slapped a shirt on and went out to say something to the garbage hauler. He slapped on a shirt and ran to the bus stop.
2. Go to slap something onto someone or something.
1. To apply something quickly or carelessly: The cook slapped some butter on the toast and put it on the plate. Running late, I slapped on some clothes and hurried off to class.
2. To impose some legal obligation, such as a tax or fine, on someone or something: The government slapped a tax on all imports. If your payment is late, the credit card company will slap on a late fee in addition to interest.