"aab" means "assigned at birth."  Generally you see it with a letter indicting male or female:  assigned female at birth or assigned male at birth, or afab and amab.  Meaning babies with female genitals were labeled female by the doctors, etc.  I am unsure why this designation is necessary for people who are not transgendered but all the snowflakes use it these days.  I have no idea what the hell this ham means by "lame aab."  Maybe she was assigned a cripple at birth?  Makes sense since she doesn't seem to run or walk much.