It is called French kissing.
French kissing typically indicates a desire for a more intimate and passionate connection. However, the meaning can vary depending on the context and the individuals involved. It's important to communicate and ensure that both parties are comfortable and consenting.
Some signs that a German guy may like you can include being attentive, making an effort to spend time with you, showing interest in your life, and being more open and affectionate than usual. It's also a good sign if he tries to communicate with you frequently and makes an effort to get to know you better.
It could indicate that he is attracted to you or interested in kissing you. Some people also look at lips out of habit or when they are deep in thought.
French kissing typically indicates a more intimate or romantic interest in the other person. If your guy friend french kisses you, it may suggest that he has feelings beyond friendship and is interested in pursuing a deeper relationship.
winking, flirting, hanging out with you, kissing your cheek, so on
Ask them if they like kissing you and they should tell you straight forward.
That you like him
It means he likes you.
I saw it in magazines - it had a pic of them kissing!
when he says he likes you.
iam in love with this guy but i do not know if he likes me or some other girl
If a guy likes you but you don't know him he may look at you or walk by you whenever possible.
http://www.wikihow.com/Know-if-a-Guy-Likes-You
If he slowly startes showing interest, but doesn't make any moves. These "moves" can include asking you out or kissing you or something along those lines.
It sounds like he's flirting with you if he's "playfully" kissing you, so I think he likes you.
Not sure how you expect someone to magically know something.