Nuclear Cashew

Nuclear (n. from Latin nucleus "kernel," from nucula "little nut")

1. Of or relating to atomic nuclei
2. Using or derived from the energy of atomic nuclei

Cashew (n. from Tupi acajuba)

1. A tropical American evergreen tree (Anacardium occidentale) widely cultivated for its edible nutlike kernels
2. The kidney-shaped seed of this tree, eaten after roasting

Nuclear Cashew (n. Slang, nuclear + cashew)

1. A gigantic cashew
2. An inexperienced person who makes voluble claims to skill or knowledge of nuclear technology

aka. double nut
see also. armchair quarterback, pajama jerry