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1.
to make things, phrases, or situations gay and/or retarded without any effort.
Dave really modaned the moment with all his talk of men with cerebral palsy having massive penises.
by Willy Tallywhacker October 25, 2006
 
2.
bulk-forming laxative laxative.
"Today, after I used modane, I took the best poop of my life"

"modane is the best constipation reliever of all time"

"I only use modane when I haven't had any in weeks'
by Mosbys Drug Reference Book April 30, 2010