Mark Halperin

David Spade says it's cut and dry -- you CANNOT call a U.S. president a d*ck a la MSNBC analyst Mark Halperin ... so the big question ... what slang word for male genitalia CAN you call a president? Check out TMZ on TV -- click here to see your local listings!

"Time" editor and MSNBC analyst Mark Halperin has been suspended indefinitely by the network after he called President Barack Obama a "d*ck" on live television ... and the footage is hilarious. Mark dropped the d-bomb earlier today on the "Morning Joe" broadcast -- claiming he thought Obama was…