Malding is a condition originating from Uganda, where the patient zero was found (circa) 1990. It is often described as the human version of molding. Certain tobacco products like Snus are said to enhance the effects of malding.

It is characterized by the victims baldness, lack of skill and anger issues. Subjects of the condition are also said to have decorated their room with self portraits and paintings of things that make them feel uneasy.

When a bald man doesn't get his mount in World of Warcraft he may shout a phrase showing the mald phase has begun.
ex.
"Dogshit ass game dood" "Man what the fuck dood" "smashes head against keyboard* FUCK" "Cock ass"

The words Mad and bald put together. Someone who is Mald is either a mad and bald person, or a person who is Mad about being bald, and is therefore taking their frustration out on others.

Being mad and bald

A combination of the words bad sad and bald. The streamer Ludwig Ahgren has used this phrase before in his Pokémon Black and White 2 Nuzlocke as Darth Mald

When someone is expressing a large magnitude of rage, often over something relatively small, that the stress they are giving upon themselves causes their hair to fall out (thus, balding). Portemanteau of "mad" and "balding".

when someone is both mad and balding.