The sign for "hammer" is done by miming the use of a
hammer. Grab an imaginary hammer using an "S"-handshape and
make two quick strikes on an imaginary nail. (If you hit your
thumb make sure to let loose with an imaginary yell. ;-)
"Hammer a nail"
Hold a "pretend' nail in your left hand and hit it twice with your "pretend"
Yes, as a matter of fact, I can amuse myself for hours.
If you mean "hammered" as in "drunk" see:
Also see: SCREWDRIVER
You can learn
Language (ASL) online at American Sign Language University ™
ASL resources by Lifeprint.com © Dr. William Vicars