Mala Suerte

Used as a nickname and an insult for someone seen as weak, easily pressured, or likely to betray the group. The diminutive '-ona' suffix here adds contempt rather than affection, making it more cutting than 'rata' alone.

Prison slang for the punishment isolation cell. The image is of something cramped and inescapable, like a crab's claw. Context-specific: inmates and guards in a closed environment would use it naturally.

Widely used in criminal or street contexts across Spanish-speaking communities in the US. When someone 'canta,' they break under pressure and give up names or information. Not vulgar, but clearly marks an underground or prison register.