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A person who is considered dorky; a nerd.
bertsos by John Stathopoulos August 18, 2003
Related Words

bertos banditos 

A man who prematurely ejaculates at the sight of another man petting a cat
I was over at Pries' place last night and Roberto went all Bertos Banditos when Mark was petting his cat.
A drive-thru Mexican restaurant with cusine that borders somewhere between a full-out cantina and fast food- The Mexican equivalent to Cheap Chinese take-out. The menu consists of typical Mexican-American fare and is usually substantial in size. It is NO generalization to note that every 'Berto's has a signature burrito- Often named after the state or city that particular burrito is purchased in.
Also to note that most 'Berto's are converted Weinerschnitzel, Raxx or Naugle's restaurants- offering a clean, slightly antiquated environment, and that ALL 'Berto's have an unlimited "chips n' salsa" bar inside.

Examples of a "Berto's" include, but not limited to:

Umberto's

Adalberto's

Humberto's

Oberto's

Emberto's

Hamberto's

Bertolinos

Abertos

Robertos

Ebertos
(Calling from Drive-Thru)
"I'm at 'Bertos, you want anything?"
"Which one?"
"The one on (xy) street."
"Pick me up a California Burrito Combo, but tell 'em no salsa. I don't like the way they do it there."
"Yeah, the salsa at the other 'Berto's is a little better."
'Bertos by Travieso Mentira March 23, 2008

Bertowski 

Generally just a big ol goof, and a lil angyat times
He is a Bertowski, he always does dumb shit to make people laugh
Bertowski by lil jimmay April 1, 2020

Bertosis 

Bertosis is a medical condition that causes a person to smell as if they ate ass first thing in the morning for a month and never brushed their teeth.
Man, did you smell that girl she straight up has Bertosis
Bertosis by Wolgang_Fuk January 11, 2019