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First thing to remember is that when you create an alias it is yours and no elses by default, hence if you change to root (or any other user) it will not exist for them. You can of course make it global to all users but this is generally not the solution.
You mentioned it works the first time, so just to clarify, the following are the steps you take:
$ alias mmc='macchanger-gtk'
<something happens here>
You must be root for use macchanger-gtk
Please confirm the above is what you are referring to and this is as your standard user?
output bash: No command 'mmc' found, did you mean:
No command 'mmc' found, did you mean:
Command 'mc' from package 'mc' (universe)
Command 'mzc' from package 'racket' (universe)
Command 'qmc' from package 'qmc' (universe)
Command 'mic' from package 'mic2' (universe)
Command 'moc' from package 'qtchooser' (main)
Command 'mm' from package 'multimail' (universe)
Command 'mpc' from package 'mpc' (universe)
Command 'mmv' from package 'mmv' (universe)
Command 'mmg' from package 'mkvtoolnix-gui' (universe)
Command 'imc' from package 'italc-management-console' (universe)
Command 'zmc' from package 'zoneminder' (universe)
Command 'mmd' from package 'mtools' (main)
Command 'wmc' from package 'wine1.6' (universe)
Command 'smc' from package 'smc' (universe)
mmc: command not found
As no one has said yet, the reason you received all the errors above is because you left a space between mmc and = sign. Bash requires no space between the two otherwise it considers both alias
and mmc to be commands. This will be the same in your .bashrc file.
Once you have edited the file you need a new login to test if it has worked and generally you can simply open a new terminal to test that.