godan verb (-ru), intransitive verb
to be jealous; to feel jealousy
Casual slang verb formed from ジェラシー (jealousy) + る. Used mainly in informal conversation, especially among younger speakers.
彼氏が他の女の子と話してて、ちょっとジェラった。
I got a bit jealous when my boyfriend was talking to another girl.
友達のインスタ見てジェラるの、やめたい。
I want to stop getting jealous looking at my friend's Instagram.