Jejejeje comes from the way laughter is written in Spanish, where the letter j makes the h sound in hehehe, so jeje reads as a written giggle. Online that spelling became a shorthand laugh in chats, comments and forums across Spanish speaking communities, then spread into wider meme culture as a texting style laugh. The spoken version turns that typed laugh into a short audio reaction, which is why creators use it for teasing, light sarcasm and playful responses where an English haha would feel too plain or too loud.