Ilícito: Euphemism for "bribe"

Imaginaria: In the military service, night watch

Imbancable: Unbearable (slang)

Ir al frente: To advance, i.e., in any activity, to act aggressively

Ir de cuerpo: To defecate

Irse al humo: Attack without hesitation

Irse al mazo: To quit, to stop when doing something

Irse en banda: Drop on the side