I started a new thread about
Shirt Ideas and Techniques, but if you're thinking of just ideas for slogans about boobies and other innuendos:
"Over Hill, Over Dale..." (from the Caissons Go Rolling Along)
"If You Can Read This, You're Too Close!" (In Braille)
"White Goods Sale! Pillows 50% Off!" (On a very low-cut T-shirt.)
"If it moves, fondle it." (Saw that one at my local high school 40 years ago. The school sent her home to change.)
"They're Boobs, not Handles."
"I have eyes, too."
"Everything's Bigger in Texas"
"Make me an offer I can't refuse."
"Eat your heart out; I'm married!"
"For Sale or Rent"
"Crumb Catchers"
"MAMMAL"
"Built for comfort, not for speed"
"THIS SIDE UP"
"CAUTION: WAKE TURBULENCE"
"Dangerous Curves Ahead"
"Grapple Fixture" (It's a Space Shuttle thing.)
And especially for the IBTC:
"Quality, not Quantity"
"Under Construction"
"100% Natural"
The "Real" logo from a milk carton.
"Only part of the package."
"But wait! There's more!" (Add the Ronco logo at your own risk.)
"Slippery when wet."
"Mach 3" (Guaranteed to start a conversation about streamlining.)
An image of the cow mascot with a slash through it.
"90% Fat Free"