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1.
1. One who makes one's self laugh, or a person who laughs at their own jokes.

2. A person who is turned-on by their own laughter.
If only Steve were as funny as he thinks he is; he's quite the laughterbater.
автор: pulledup 18 июня 2010
 
2.
someone who sets himself up to laugh, either alone or in a group. this person instigates a specific response from people just to make himself laugh
Guy 1 knows what Guy 2 is going to say beforehand, making him a laughterbater

Guy 1: "What are you wearing?"

Guy 2: "Nothing!"

Guy 1: "Hahahahaha."
автор: elrobe 22 февраля 2013