Why do people use "properly" instead of "probably"?

[Inactive]

I've seen this many times with many people.

Example: "She properly left it at home".

Am I wrong or is this slang?

 

[Vision]

They can not spell

 

[GodKnowsBest]

I've seen this many times with many people.

Example: "She properly left it at home".

Am I wrong or is this slang?

This site is occupied by FOBs but auto correct might explain it.

 

[McLovin]

 

[Arman]

Never seen it b4

 

[GodKnowsBest]

Abdi, for a moderator your threads are pretty dead. You need to learn the art of Clickbait my friend.