The act of unconsciously typing nonsense while half asleep in a Messenger conversation. The nonsense is usually ridiculously misspelled words, or just complete gibberish.
Jenna: OMG Fred, what are you doing up so late?
Fred: PHusicdp aper die tmrowqqwr
Jenna: Are you sleep typing?

Jenna: Last week, I was talking dirty to Fred over messenger and he FELL ASLEEP.
Eileen: Lswlorlyyy/
Jenna: =_=
by LimeFaceX August 10, 2009
5 Words related to Sleep Typing

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