When dating someone and texting its an alternative to saying lol after a comment. Instead type "sjfu" if your crush says something cute but it doesn't qualify as laughing out loud and its more to appease him.
Crush: Well the comebacks will be the champs so you will like him at the end, so we have the same likings in the end.
You: sjfu. Very true... Cheers to the champ and cheers to you. Besos!!