godan verb (-ru), intransitive verb
Slang verb derived from English 'jealousy'. Used in casual conversation, especially among younger speakers.
彼女が他の男と話してるのを見て、ちょっとジェラシった。
I got a bit jealous when I saw her talking to another guy.
友達の成功にジェラシるのはよくないよ。
It's not good to be jealous of your friend's success.