Usually tall. Very intelligent and mature. Seems like an uptight person but when you know her she's goofy and playful all the time. She's a low keystoner. Eats a lot but never gains weight. Very strong mentally.
A helmet is British slang word that's used to describe an individual who's being stupid or has completely no reputation to join a conversation or add their opinion.
Gary: So yeah I was walking down the street yeah and this stunn--
Oliver: Yeah but I don't care.
Gary: Who the fuck is this helmet? Jog on.