Fuckin' insertion

Fuckin' insertion is a process in English by which a restricted class of infixes (fuckin', bloody, bloomin') is inserted between two metrical feet of which the latter one contains the syllable that carries the main stress.

Example
(i)	mònonga-fuckin-héla fàn-bloody-tástic àbso-bloomin'-lútely (ii) * monòng-fuckin-ahéla * chíco-fuckin-pèe * chi-fuckin-cágo

Another term for this process is Expletive Infixation.

Link
Utrecht Lexicon of Linguistics