exploding offer
n.— «Some employers may over-estimate the greed of graduates. One management consultancy offered several candidates £1,000 in advance on salary for “moving expenses.” It gave another an “exploding offer” and told him to name his price.» —“: Graduates who play hard to get can be put off by old boy network” by Anna Healy Fenton Financial Times (London, England) Aug. 20, 1984. (source: Double-Tongued Dictionary)