lapslock Share definition Flag 1. Typing in all lowercase. 2. Failure to use CAPSLOCK when you should be using CAPSLOCK. 1. this is lapslock. 2. In an all-capslock forum, this is also lapslock. lapslock by Lullabee January 24, 2009 0 0 Get merch Get the lapslock mug. Buy Now — $32.95 See more merch