When your adult male friend gets hammered and passes out fully clothed...for consecutive nights...in the same clothes.
Dude! You need to change out of those manjamas at some point. It's been 2 days, I don't think you can go out again like that.
by Been There 2 March 31, 2011
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Manjamas have several meanings:

1. Cotton or flannel plad drawstring or elastic waistband pants that men wear to bed or when just chilling around the house. Usually they have an opening in the front with a single button or a drawstring.

2. If a man sleeps naked, this is sometimes referred to as wearing manjamas.

3. If you tell your young son to go put his pajamas on, to make him feel more like a big boy you might call them manjamas.
Billy Bob just got a new pair of camoflauge manjamas and manslippers from Bass Pro Shops.

Look honey, I'm wearing my manjamas.

Son, go put your manjamas on and then I'll read you a story.
by Greasepaint April 11, 2010
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Pajamas, with full arm and leg sleeves, as worn by an adult male.
She was surprised when I exited the bathroom wearing my manjamas for bed.
by Master(er) November 9, 2007
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