Possible Clues:

• ''Dollars, taxes,'' e.g., for Dallas, Texas
• The lowest form of wit
• ''Don't be fuelish,'' e.g.
• Nash specialty
• ''My bike won't stand up. It's two tired,'' e.g.
• ''Pick a cod, any cod,'' e.g.
• Bit of paronomasia
• What a joke to get over the smelly gent!
• According to Oscar Levant, it's "the lowest form of humor--when you don't think of it first"
• Groaner?