Top definition
the effects of lost sleep due to school starting before you can finish getting all of your sleep (usually on mondays)
hey u look tired

yea, i was at a party till four nd i had to wake up at six for school

hey! thats class lag
by mesoosleepy April 14, 2010
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