snot, nasal mucus
George jura haber encontrado una con sabor a mocos.
George swears he found one that tastes like snot.
— Harry Potter y la piedra filosofal (2001)
Dile que no pegue los mocos en el cristal.
Tell him not to stick his boogers on the glass.
— Kung fu (2004)
Mocos de trol.
Troll snot.
Tengo mocos.
I have a runny nose.
O a mocos.
Or snot.
Toma un pañuelo, se te caen los mocos.
Grab a tissue, your nose is running.