SOLID OOP in LISP

I'm making Scheme-like OOP language.
I want its OOP to be good and SOLID.
How do I implement Open-Closed Principle in a language with first-class lambdas?

(define (class name . anus) (lambda () (list anus)))


(define you (class faggot huge nipples)
   (define goyim (let ((penis small) (butthurt #t) (palestine (lambda (muslim) (plan '(911 and middleastern political turmoil) to secure zion))) (+ penis butt)))

dynamic typing ftw