When you cum so hard that your toes curl.

A phrase to describe someone who is cognitively degenerating. Synonym of "going off the deep end". Can have varying degrees of severity.

Reference to the song "Hey You" by Pink Floyd. The line "and the worms ate into his brain" makes no sense in an otherwise linear and literal narration throughout the lyrics.

When you reach orgasm and curl your toes whilst its happening.

When you and your partner are so horny that you have sex before she takes her pantyhose off, so her toes curl up with every thrust.