What am i missing?

I keep seeing this meme on twitter but i dont get it

“To hell with everything I studied”

I’m a philosophy grad but I still don’t get it. It says “To hell with/fuck/(literally) I shit on everything I studied”

No Irish... I don't get it

My mom got this wedding invitation in the mail. None of us know what "no irish" means. I'm hoping it's a joke we don't get

My stupid friends told me another "joke" I don't get, please help me

Why?

What

???

Wait what does it mean?!

I feel like I'm pretty in touch with internet happenings, but I came across this meme the other day and idk what it meant. Can anyone help with this one?

I know it’s something sexual, but I’m not getting it.

Idk if im just dumb i think its jacking tate off but thats all i understand