Green’s Dictionary of Slang

freak v.1

a euph. for fuck v. in various senses.

[US]H. Ellison Web of the City (1983) 79: Greek thumbed his nose at the ceiling. ‘Frayk ’em!’.
[US]Eble Campus Sl. Apr. 3: freak it – forget it, don’t let it bother you.
[US] in J. Breslin Damon Runyon (1992) 343: He had decided that he wanted to get out of town for good and settle in Hot Springs, Arkansas [...] So freak Carnera.
[US]Eble Campus Sl. Apr. 4: freak me – an epithet of self condemnation: ‘Freak me for missing my class.’.

In phrases