Since Day 

Referencing the beginning of a particular event or happening, esp. if the day cannot be remembered/was never specified.

Who you backing in dis fight bruv?

Man's backing Leroy yugetme, we've been friends since day!

Since Day by SansPeur17 July 2, 2011

Sinclair

A born leader although not obvious. But due to his curious and giving nature, and his imagination, he is able to focus and listen and give of himself, something someone so young doesn't normally possesess. Wise beyond his years.

King Arthur was such a Sinclair.

Percey Jackson was modeled after a true Sinclair.

Sinclair by Synda May 22, 2010

sinceafee 

This is a word that only Josiahh2x and 2door Q can CLAIM, SAY, and UNDERSTAND ... straightuhhhh

I been doing this sinceafee

sinceafee by Jos Montana (@joscantbfound) March 21, 2020

sincleanserr 

A lame

Sincleanserr is the lamest of all lames!

sincleanserr by shinesfresh October 31, 2022

Sinchana 

An upper echelon human with absolutely no flaws whatsoever. Best of the best.

John's such a nice guy, how can anyone hate him.
Yeah, he's definitely a Sinchana.

Sinchana by us3rnamecannotbe3mpty December 24, 2019

Since 'Nam 

A phrase used to describe an event/ occurrence in one's life that hasn't happened in a long time. Typically used when referring to family outings or sporting events.

Joe: "Hey John, want to go golfing today?"
John: "Sure, but I haven't hit the course Since 'Nam!"

Joe: "We have to celebrate Grandma Jane's birthday today."
John: "Dude we haven't celebrated Grandma Jane's birthday since 'Nam!"

Since 'Nam by mdale July 16, 2013

since... the incident 

A phrase popularised by Australian YouTuber frezned. To be said ominously after saying something that has or has not happened. It has an even more powerful effect if you ask/bribe some friends/passers-by to shake their heads and tut immediately after you have spoken.

I haven't eaten marshmallows and ketchup since... the incident.

No one has seen Jennie since... the incident.

I've been wearing odd socks since... the incident.

since... the incident by purple_beret January 21, 2012