It is a noun or a verb, referring to the process of trying to become as attractive as possible.
How to Use the Word
As a Noun (The action/concept):
“He spent hours on Reddit learning about looksmaxing.”
As a Verb (The activity):
“I am trying to looksmax by going to the gym and fixing my skin.” (Present tense)
“He looksmaxed for six months before going back to dating.” (Past tense)