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1.
Someone or something that is funny and retarded at the same time. A comical insult of a place or person.
1) My friend Aaron is a big tardwhistle. (As opposed to my friend Aaron is a jack-ass.)

2) Stop acting like such a tardwhistle!

3) My boss is a real tardwhistle.

4) This place is full of tardwhistles.
by Brian Hodle January 02, 2008
 
2.
The whistle that a retard wears around their neck and blows when they are lost. When you call someone a tard whistle, you are saying they are more retarded then a lost retard.
What's up tard whistle? The most drulling shitting themselves idiot.
by retodded retodd November 19, 2010