Related Clues:
- Bit of mirth
- Gag reflex
- Chat room chuckle, for short
- Online prefix for 'cat'
- ''Oh, very funny''
- "Funny ... not!"
- Possible reaction to a n00b
- 'That's a good one!'
- E-mail cackle
- ''Funny!''
- Ubiquitous online initialism
- 'That's rich!'
- Response to a funny YouTube link, say
- "I get it, but ..."
- Response to an e-mailed joke, maybe