Wrestler (martial arts)
Schwinger is a popular name for a certain type of punch and often appears in connection with martial arts .
A vibrator is a strike prepared by an arcuate movement (swing) of the hand, which is intended to increase its intensity. Since you go back a long way with the Schwinger and thus increase your overall strength, this goal is usually achieved.
In boxing , the swinger is a long hook . However, there is little practical use because the swinging motion of a vibrator is very large and can therefore be avoided very easily.
Web links
Wiktionary: Schwinger - explanations of meanings, word origins, synonyms, translations