#

Where I'm from it's to be added to the end of a phrase or sentence in order to give it romantic implications in IM and texts.
Originating from the MSN eye-brow waggling emoticon which is sometimes has the keyboard shortcut "#"

Person: "He walked her home last night" (neutral sentence)

Person: "He walked her home last night #" (meaning something happened between them)

by hairysocks45 July 14, 2009

#

Roblox has a filthy moderation system uses # and it is horrible. Like when you try to say a number or misspell something it goes from "Hi, frend" to "Hi, #####" and it is total crap

I want # burger and # packs of fries

by Wavemelon November 19, 2018

#

A common abbreviation for "Heil Hitler" used by edgy alt right and neo nazi internet trolls. Often inserted into innocent seeming media where it can only be understood by those 'in the know' ie a dog whistle.

Sally:"I think we need some permanent solution" Sue:"#metoo"

by headingtoshore May 28, 2019

#

When someone accidently presses it instead of the enter key. An idiot tbh.

Person 1: OMFG YEAH, DO YOU AGREE?!
Person 2: yeahh#
Person 1: why da hash?
Person 2: STFU NOOB.

by HEATHHYYY<3 September 18, 2008

#

used in text or chat as a replacement for 'xo' as it is a tic tac toe grid which holds exxes and ohs.

"k. im off to the cafe for a change of scenery. ill talk to you later #"

"bye4now #"

by J. Raymond March 23, 2010

#

Used to express love. Derives from the symbol for heart, <3 , which was typed incorrectly as <#, and then shortened into just #.

I # Arlene, she makes my world go 'round.

I feel so much # for Arlene right now.

by thekeenone May 10, 2007

#

For tweets, instagram, facebook, and such

#josh hutcherson is cuuuuuute

by first_jumper♡♥ November 25, 2013