2

adverb1

1. •
   (Internet, informal) Abbreviation of too.

   • Can I come 2?

preposition2

1. •
   Abbreviation of to; designating conversion from one format to another.

   • pdf2txt, i.e. conversion from PDF to plain text
2. •
   (Internet, informal) Abbreviation of to.

   • I have 2 go now.
   • Send files 2 him.

noun2

1. •
   (Internet) A good joke.
2. •
   A penalty for some types of infractions in cubing competitions, which results in two seconds added to one's solve time.

   • I received a +2 for one of my solves because the top layer was misaligned.

noun1

1. •
   (Internet) A bad joke.