What is the meaning of 'tongue tied'?

Tongue TiedIt's a colloquialism meaning that you can't seem to find Words and are unable to speak, as if your tongue were tied in knots.

Some children are born (like my first son) with their tongue anchored to the bottom of the mouth which makes it difficult to talk. The membrane which ties it down has to be cut with scissors by a doctor.

Answer

Also originates from the phrase, "Cat got your tongue"

That means when you are in awe and can't bring yourself to speak.

For example, a guy walks down the steet, sees the hottest chick in the world and is tongue-tied.

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it means that he or she is too shy or nervous to speak.
When used as an idiom it means being unable to get ones Words out. It means having trouble saying what one wishes to say.
it means you are either speechless or you are trying to say something and it comes out sounding like a bunch of gibberish.
A person who is tongue tied is too nervous to speak.
Tongue tied means that your tongue is attached to the bottom part of your mouth with a short membrane. This decreases the mobility of the tongue since it is basically tethered to the mouth. This is a simple issue to have repaired, as a doctor can snip the connecting membrane in most cases, freeing the tongue.