look up any word, like blumpkin:
 
1.
The tendency to mumble unintelligible or foreign-language verses to popular songs before loudly shouting notable phrases. Named for the rapper Shaggy, of "It Wasn't Me" fame.
The Shaggy Effect in it's original context:
-How could I forget that I had given her an extra key, all this time she was standing there she never took her eyes off me
-hrmunrmudrpdrp bumbadumbudoopoo. brdabrdabopbop dumdadumdadeedu. badabadabopbop tatabdap, badabadaboomboom BABY NO WAY!!!

More recently:
-badamdesilla weyudasola badabambasura DANZA KUDURO!!
by white boy 692 December 17, 2011