Es un término coloquial que la gente usa por pereza, lo que realmente quiere decir es "what's up" pero como es demasiado largo prefieren decir sup, En español sería, ¿qué tal? o ¿cómo andas?.

Significa whats up? Q significa " q pasa"

sup Verbo

Plural: sups

1.sorber, tomar a sorbos, tragar poco a poco; Sinónimos: absorb, draw in, sip, sip in, drink in, sip at, suck; Take solid or liquid food into the mouth a little at a time either by drinking or by eating with a spoon.

2.cenar; Sinónimos: dine, eat dinner, eat supper, have dinner, have supper, take dinner; Have supper; eat dinner.

3.comer bocado a bocado; Sinónimos: eat one mouthful at a time; Take solid or liquid food into the mouth a little at a time either by drinking or by eating with a spoon.

sup Sustantivo

1.sorbo; Sinónimos: sip, nip, sipping; A small amount of liquid food.

A sup of ale.