to suck
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to suck on
To move something around in the mouth and work it with the tongue and lips in order to take in its flavor or dissolve it, without biting it.
Das Kind lutscht genüsslich an einem Bonbon.
The child is happily sucking on a piece of candy.
to suck
Colloquially, borrowed from English ('to suck'), meaning 'to be very bad' or 'to be annoying.'
Das neue Update lutscht total, jetzt funktioniert nichts mehr.
The new update totally sucks; now nothing works anymore.
to suck
A colloquial expression, often perceived as vulgar, for performing oral sex.
Der Rapper wurde für seine provokanten Texte kritisiert, in denen er oft darüber singt, dass Frauen lutschen sollen.
The rapper was criticized for his provocative lyrics, in which he often sings about women being supposed to suck.
The three meanings are clearly separated by context. The neutral meaning refers to edible things, the colloquial one to a bad situation, and the vulgar one to a sexual act.
Ich könnte stundenlang an diesem Eis lutschen.
I could suck on this ice cream for hours.
In the basic meaning, the verb is used either with an accusative object or with the preposition 'an' + dative. 'An' is used when you are only sucking on the surface of something.
Das Baby lutscht zufrieden an seinem Daumen.
The baby is contentedly sucking on its thumb.
The meaning 'to be very bad' is a direct borrowing from American English ('to suck'). It belongs to youth slang and is very informal.
Ich finde, der neue Film lutscht total.
I think the new film totally sucks.
In the sexual meaning, 'lutschen' is a colloquial expression and is often perceived as vulgar. It should be used with great caution, as it can quickly come across as offensive.
Er wurde wegen seiner vulgären Sprache kritisiert.
He was criticized for his vulgar language.
to blow
Blasen and lutschen can be colloquial and vulgar terms for oral sex. Blasen is the more usual term in this sense, while lutschen describes the action more bluntly as sucking and therefore sounds cruder. In a direct vulgar statement, lutschen can thus express the rougher nuance.
Er sagte vulgär, dass sie an seinem Penis lutscht.
He said vulgarly that she was sucking his penis.
Er sagte vulgär, dass sie ihm einen bläst.
He said vulgarly that she was giving him a blowjob.
