Schweifen is swooping, as in ballroom dancers shvife around the dance floor. The past tense version of this word is wonderful: schwuften (SHVOOF ten). Ballroom dancers shvoofed around the dance floor.
If you are “swooped out” (ausgeschweift, ow! ss geh shv eye ft) you have run riot, you are decadent, dissipated.
(Shv EYE fen.)