An Etymological Dictionary of the German Language/prassen
prassen, vb., ‘to riot, carouse,’ ModHG. only, from Du. brassen, ‘to gormandise’ (akin to bras, ‘feast’). OIc. brass, ‘cook,’ and brasa, ‘glowing coal’ (comp. OFr. brese, Prov. brasa), may be connected with it.