Work friends than one is slightly sociable with. You would go with them to happy-hour after work, but never hang out with on the weekend.
Mike's just a happy hour friend. He's cool enough, but it's always shop talk
with him. I don't need that s**t on the weekend.
English used by non-native speakers. Usually "proper English" learned in school that no one really uses. Also, using proper English to help a non-native speaker understand you.
Man, I'm starting to use fenglish after hanging out with all these Germans.
邮件由 firstname.lastname@example.org 发出。我们决不会发送垃圾邮件。