The most evil person. She may seem nice to everyone but is a total bitch and fucks girls. She is the most horny girl ever. Sienna will minipulate you and kill you.
by Sienna 2.0 August 5, 2018
Get the Siennamug. this name can mean a stuck up and rude back stabbing bitch she can be fake to many people and make them believe that she is a nice person but deep down she is a fake friend. there are many siennas that can be truly nice but look closely and choose your friends smartly.
Sienna :OMG your my best friend Molly
Molly :wow thanks
Sienna says to kobi :wow i hate Molly
kobi: would choose you over my Molly any day
Molly :wow thanks
Sienna says to kobi :wow i hate Molly
kobi: would choose you over my Molly any day
by onki onki July 28, 2019
Get the Siennamug. Sienna is a bender
by Sienna is gay August 25, 2019
Get the Siennamug. 
A backstabbing bitch u never want to meet. she looks like a cow shit on her face and smells like it too. She likes to send nudes in her free time and she runs when u try to confront her about something bc she is a fucking cereal box. also never kiss a sienna either you will die from her breath and her tongue going down your literal throat. Never truth a bitch like sienna.
by snakzs March 2, 2019
Get the Siennamug. the most toxic person you will meet, untrustworthy, rude, not pretty, backstabber. If you meet a sienna cut them off and run!
by _truth_giver_ July 1, 2020
Get the Siennamug. A person that is not to confident in herself. She will always put others before her and care for friends and other she doesn’t know. Makes friends to easily and without knowing. She has meny disorders and worry’s, but creeps them inside. She lets it out at home in her room. Funny, kind, sweet, empathy soooo mush when you say something hurts she feels it. She is such a good friend she does not know how purity she is. Has a hard time taking compliments from people, but says thx anyway even if she doesn’t believe it. If you everrr have a Sienna never giver up she is the best friend you could ever ask for.
by Starlightmoon October 7, 2021
Get the Siennamug.