Uhm is a word often used by programmers when they respond to a question that has no context, or is way too stupid to answer.

Also used as a response to something inaccurate.

Also used with 'uh'.

When someone goes to the gym and spends 90% of the time on their phones scrolling through social media

The Definition of uhm, is like when you can't think of anything to say, as an Answer. So you say UHM I don't know

A cross between "uh" and "um". Usually used when you are talking to a complete ass.

Uhm can be used as "uh" or "um" put togehter, making "uhm". But it can also be used as UHM meaning u horny mate, i made this discovery by experience.

1. A sound made by those who are rectally intelligent to realize that they must already have thought of an accurate response before opening their mouth to make any sound.
2. A sound created by an individual that enjoys hearing their own voice over answering any question posed to them.
3. An Annoying noise used by those whose who seem to be to afraid of speaking for fear of others knowing they are stupid

Synonym for the contraction: "I'm".

Can be used alone or in conjunction with a trailing "a", but in most of those cases, this results in dumbing the word down to a simple umma.