The squiggly line that furries use at the end of sentences to sound cute/horny.

Voluntarily Celibate.
A person who chooses to be celibate. Can be for any given amount of time, for a short period or for their entire life. Can be for religious reasons or not.

related: incel

Sometimes used when IMing or on forums to denote trailing off or accentuating the final syllable of a word.
Note the use of extra letters preceding the tilde to complete the effect.

The character ~ is colloquially used in written form in some areas of the UK to denote sleazy, sordid, or otherwise base behaviour.
~ can also cover flirtatious behaviour with the opposite sex: you are never ~ with the same sex.
An ability to ~ is generally viewed as being a positive personality trait, unless it is used on a friend's mother, grandmother, or domestic animal. Being ~ to a friend's sister is usually acceptable.
The vast majority of the world's virgins, comic book fanatics, computer scientists, and train spotters wish they had some ~.

A little devil of a cat

A very positive general exclamation. Derived from the tilde (~) character on a computer keyboard. In Internet culture, the appearance of tildes have come to connote strong reactions of happiness or approval. It stems from young computer users in highly excited states having a tendency to miss the exclamation point (!) key while typing, resulting in tildes becoming mixed with exclamation points in their writings.

1) A curved line, used over N in Spanish for the palatal nasal (the middle sound of "canyon" and "onion"), or nasal vowels in Portuguese (like in the city name São Paolo). 2) The character ~ (Shift-GraveAccent on a typical PC keyboard), used to similate smoke emanating from an ASCII cigarette: <//////*~~~~~