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noun: Liquid whatchamacallit--generally particularly difficult-to-work-with sticky liquid., such as epoxies, RTV (room temperature vulcanization silicone glue/sealant).

verb: joining, attaching, or embedding widgets using hookumpuckee-like substances.
To waterproof the circuit board, it was hookumpuckeed into a block of RTV.
by engineerofsorts May 12, 2010