Do you know the origin of that joke?

http://forum.bodybuilding.com/showthread.php?p=130828
The thread it originated from,and I actually go on that site regularly,just search sketchbrah.

Oh my god. lol. thank you

Yes, and it goes well with the theme song for Thomas the Train!

I don't, care to enlighten me?

On February 16th, 2002, Body Building[10] forums member squirrel submitted a post asking how to work a specific arm muscle. In the thread, forum user bubbaT responded with, “yo’all better shut ya fukin mouth yo bee-yotch,” to which user Chris C replied “do you even lift?”

quoted from Know Your Meme

I don't know either

I think it was from an old copypasta on /b/ where a guy was saying how great he was had how weak the users were and he used the words

oh

Oh, wait. Turns out I was wrong. knowyourmeme .com/memes/do-you-even-lift