The most commonly used insult on the internet used by 12 years/idiotseven though they have no absolutely no knowledge of what that person does with their time.
12 year old: LOL look at this funny new video tat i found on youtube!!!1!
18 year old: been posted already
12 year old: LOL loser u must have no life if all u do all day is watch these vids LUL
Somebody with no life is one that doesn't value their own time, and so will spend it in ways that even they feel or know are a waste of their time (although they may not admit it).
As different people enjoy different things and priorities vary by person, this is often used (by people who disagree with what is or isn't a good use of time) to judge and insult people who are actually happy with the way they spend their time.
Alternatively, it could refer to somebody who is very dedicated to something (especially something frivolous or negative), at the cost of most anything else.
1 (translated): Wow, I can't believe you spend all your time doing something you enjoy that I don't, you must have no life.
2: Yet you have nothing better to do than judge people like a prick. It's ironic that you sound so full of yourself, since it makes it seem like you think making fun of somebody's hobbies means you have a life.
3: Are you two seriously arguing over who does or doesn't have a life? Both of you need a life!
4: Time is one of life's most precious resources. Do not squander it by having no life, or by listening to those that say you have none.
5. Unless you're hurting people with what you're doing. In that case, get a life.
A person who eats all the food in the fridge, plays Minecraft, skips online classes, uses discord to talk shit, and is toxic as hell. It’s understandable if you’re in your 12s but 14+ and your a loser. Fat fuck u disappoint your parents u have no life
No life Jasper: I’m fat, stupid, and scum but I don’t want to admit it so I act up in front of my brother who does basketball and benches 400