A brazilian portuguese slang for vulva, pussy. In portuguese of Portugal, the meaning is completly different: purse, pouch. That slang is very used in theUnited States where there are big colonies of brazilians: state of Massachusets, Newark, NJ, New York City and states of California and Florida.
" She is not so beautiful as her sister, but has a very nice boceta ( or pussy )."
" Ela não tão bonita como a sua irmã, mas tem uma ótima boceta"
It can be a person or a situation involved in something embarrassing like when it make you feel that you want to disappear from the face of the earth because of that stupid action or situation
I was with my girlfriend having a great time but my mom show up asking why i forgot to feed the pigs in the barn. gosh this is a boleta situation!!!