Día de la Madre – Mother’s Day
Futura madre – an expectant mother
Lengua madre – mother tongue or first language
¡Madre de Dios¡ – Good heavens!
Madre patria – mother country
Madre política – mother-in-law. Suegra is more common.
Madre primeriza – first time mother
Madrear – to insult someone. In México madrear means to kick someone’s butt or hit them hard.
Madreperla – mother-of-pearl
Madre soltera – an unmarried mother
Mentar la madre – to insult someone’s mother (Don’t do it!)
Salirse de la madre – to go to far or go beyond bounds (figuratively)
¡tu madre! – F…you or Get f…ked! (very, very insulting). Be prepared to get into a fight or even die if you say this to the wrong person.

Tiquismo or Costa Rican expression

Madre solo una y como ella ninguna – There is nobody like one’s mother.
Madre solo una y como la mía ninguna – There is no mother like mine.
Mamacita solo una y como tu ninguna – Something nice to say to a woman you like. It’s a piropo or compliment.