Italian verb, from the noun coglione, meaning something like "to make (someone) an idiot (=coglione)", "to kid (someone)", "to cheat (someone)".
- Non starai mica coglionandomi?
- Aren't you kidding me, are you?
(coglionandomi is the gerund of the verb coglionare, suffixed with the enclitic pronoun "mi"; the verb "stare" + gerund of a verb, is a common contruction for the present progressive)
- L'ho coglionato alla grande
- I cheated him superbly