look up any word, like eiffel tower:
To get a boner when incredibly relaxed, for no apparent reason. Usually occurs just before you go to bed.

The temporal opposite of a morning glory
Man, I'm so sleepy. Oops there goes the dusk tusk. Time for bed.

Mum: Jonny, time for bed! What on Earth is that in your pants?

Dom: Oh, don't worry ma, it's just the dusk tusk, I'm real sleepy.
by Sorsedetrontrou Fugazi June 01, 2009

Words related to the dusk tusk

morning glory boner chubby hard-on morning wood