Meaning
What does LULW mean?
LULW is a reaction image and emote created for the streaming website Twitch.tv, based on the original emote LUL which was created from a picture of John “TotalBiscuit” Bain.
This version features a tilted and zoomed in version of the original one. The emote is used to express laughter (otherwise known as LOL-ing) on Twitch.tv.
The emote LULW is a variant of the original one called LUL, which are as following:
Origin
What's the origin of LULW?
LULW was created by a Twitch.tv viewer in 2016. which was added to the FrankerFaceZ collection.
FrankerFaceZ is browser extensions, which enhances your viewing experience on the streaming website Twitch.tv by adding new unique emote, chat features etc.
Spread & Usage
How did LULW spread?
Given the popularity of the original emote LUL and the early creation date of the variant, LULW is one of the most popular emote/reaction image on the streaming website Twitch.tv, the messaging platform Discord and the message board website Reddit.
As of 10/12/2019. LULW is 5th on the top 100 most used emotes list according to the website StreamElements.

External resources
- Know Your Meme – LULW