If I remember correctly, it’s the cop dad realizing his son shot his mother (copwife) who was in the process of birthing his sibling. She couldnt complete the brith naturally, and was dying of blood loss. If you die you turn.

So dadcop was away at this time due to plot, carl shoots mom and they rip the baby out.

This meme scene is when Rick returns to learn all that has transpired, and that Carl is completely detached and uncaring (outwardly).

Rick then goes into the scene where the birth happened and it is implied he finds a walker eating the corpse of his wife.

He is, as you can imagine, somewhat bummed out and grouchy about all this.

It also marked his son’s pivot from being his little follower (as in wanting to follow his footsteps) into something much more dark.

I dunno, tried to remember. probably goofed some details