to be fair, tooting also means to blow one's horn. Which come to think of it, also sounds pretty funny. More seriously, the American Heritage Dictionary gives

to be fair, tooting also means to blow one's horn. Which come to think of it, also sounds pretty funny. More seriously, the American Heritage Dictionary gives the following definition: v. To sound a horn or whistle in short blasts. v. To make the sound of a horn or whistle blown in short blasts or a sound resembling it. v. Slang To snort cocaine. None of which is to fart. I do wonder if that meaning is a regionalism?