Define Mentally Weak Meaning

Mark and Maddog are playing b-ball on the court
Mark: Maddog get off the ground and start playing, Why are You being Mentally Weak?
Maddog: Because I am Mentally Weak
Maddog is playing soccer and gets cleated on the back
Maddog: "I cant feeel my back"(but he is still walking and wants to fight)
A-train: Why are you being Mentally Weak Maddog?
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Mr Cullen: Run faster or I will mentally weak you!
Noah: Yo sir I'm already done
Mr Cullen: Well done kiddo your great but them over there are pretty slow
Them over there: Noooooo sir pleeeeasssee don't do it not the mentally weak laser aaaaahhhhhh
Mr Cullen: YOU ARE MENNNNNTALLLYYY WEEEEEAAAAAKKKK!!!!
Them over there: Nnnnnnnnooooooooooooo!