Heh.

''Heh. Heh heh heh. Heh heh HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAAAAAA''

Used as a response to any accidental innuendo or innuendo-like wording. It's an onomatopoeic notice to the speaker that what they said sounded dirty without being too much of a smartass about it. Has anyone else ever realized how the word "innuendo" sounds like "in your end-oh", which is an innuendo within itself? It's kinda like "that's what she said", but it's more flexible.