Suck

Blasen

(vulgar: act of fellatio)

Blowjob

(vulgar: act of fellatio)

Saugen

(instance of drawing something into one's mouth by inhaling)

Scheiße sein

(colloquial: term of general disparagement)

lutschen

(to work the lips and tongue on (an object) to extract moisture or nourishment; to absorb (something) in the mouth)

mies sein

(colloquial: term of general disparagement)

saugen

((transitive) to use the mouth to pull in (liquid, etc))

saugen

((transitive) to put the mouth or lips to (a breast, a mother) to draw in milk)

säugen

((intransitive) to perform such an action; to feed from a breast or teat)

zum Kotzen sein

(colloquial: term of general disparagement)