Top definition
Short for sleeping with the lights on. Also seen in the form SWTLOed. This is the past tense form of SWTLO.
Dude: I SWTLOed last night.
Other Person: Did you see any monsters?
Dude: Hell no
by The Wikipedian October 19, 2011
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug