baobazacustommodule/observer is a typical model class alias, so the first part - baobazacustommodule - is what you have defined in <models> section of config.xml as alias for Baobaz_ACustomModule_Model (points at path /Baobaz/ACustomModule/Model), and second part - observer - is telling the name of the file within /Baobaz/ACustomModule/Model folder, which is Observer.php.
An example to make the explanation clear:
<models>
<baobazacustommodule>
<class>Baobaz_ACustomModule_Model</class>
</baobazacustommodule>
</models>
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Magento is one of the most innovative and complete e-commerce solutions to implement new generation e-Stores.
baobazacustommodule/observer is a typical model class alias, so the first part - baobazacustommodule - is what you have defined in <models> section of config.xml as alias for Baobaz_ACustomModule_Model (points at path /Baobaz/ACustomModule/Model), and second part - observer - is telling the name of the file within /Baobaz/ACustomModule/Model folder, which is Observer.php.
An example to make the explanation clear:
<models>
<baobazacustommodule>
<class>Baobaz_ACustomModule_Model</class>
</baobazacustommodule>
</models>