A party with the burden of proof must proffer sufficient evidence to carry that burden. A proffer is an offer made prior to any formal negotiations. The word proffer is derived from Anglo-French "por-", forth, and offrir, to offer. Vancouver would have been able to proffer this name. But Cyrus knows how to proffer her sass. Proffer and Thorpe formed a friendship and partnership and would collaborate on four albums. Proffer produced and mixed their debut album. Spencer Proffer (born Salek Profesorski, December 25, 1948) is an American media and record producer.