An irb session with self so help yorselves rhyms with elves doesn't it?

bad_method.rb

class << self!
end
# => NoMethodError: undefined method `self!' for main:Object

class << self
end
# => nil

self.class
# => Object

Myclass = Class.new
# => Myclass

Myclass.class
# => Class

Myclass << self
end
# => NoMethodError: undefined method `<<' for Myclass:Class

class Myclass << self
end
# => SyntaxError: (irb):13: syntax error, unexpected tLSHFT, expecting '<' or ';' or '\n'

class Myclass < self
end
# => TypeError: superclass mismatch for class Myclass

Myclass = Object.new
# =>  warning: already initialized constant Myclass
# =>  #<Object:0x136f6b0>

Myobject = Object.new
# =>  #<Object:0x1022940>

Myobject.self
# => NoMethodError: undefined method `self' for #<Object:0x1022940>

Myobject.self!
# => NoMethodError: undefined method `self!' for #<Object:0x1022940>
 
Myobject < self
# => NoMethodError: undefined method `<' for #<Object:0x1022940>

Myobject << self
# => NoMethodError: undefined method `<<' for #<Object:0x1022940>

class Myobject < self
end
# => TypeError: Myobject is not a class

Myobject.class
# => Object

Myclass.class
# => Object

python
# => NameError: undefined local variable or method `python' for main:Object

eval "class<<self;p self!;end"
# => undefined method `self!' for #<Class:#<Object:0xb94dee3c>> Epiphany! tada! But didn't you just p yourself?

# This is what we want 
eval "class<<self;p self;end
# => #<Class:#<Object:0xb94dee3c>>

myclass.rb

self
# => main

self!
# => NoMethodError: undefined method `self!' for main:Object

Myclass = Class.new
# => Myclass

Myclass << self!
# => NoMethodError: undefined method `self!' for main:Object

xxxx.rb

self
# => main

class
# => SyntaxError: (irb):2: syntax error, unexpected $end

class ::self!
# => SyntaxError: unexpected tFID, expecting tIDENTIFIER or tCONSTANT


[16] pry(main)> class << self!
[16] pry(main)*   
# baby wants something?

class.class
# => self

# K! nuff messin with banging my self

class << self
  "a gallon of fresh milk".send :self
  "Over?!"
end

class.self
# => SyntaxError: unexpected '.' did baby drop something?

"Goo goo says baby Ruby".send :self
# => "HAHA" Oh no it's too late!

There we go... glad you saw it! Hope it helped.

So what did _why the lucky stiff mean by class << self! in the baby talk image?

Maybe?
def self!
"self bang is open then"
end

[22] pry(main)> def self
[22] pry(main)* "self is self?"
[22] pry(main)* end
=> :self
[23] pry(main)> self
=> main
[24] pry(main)> self.send :self
=> "self is self?"