You have a fantastic sense of humour!
'Umorismo' = u-mo-RI-smo, stress on third syllable. 'Fantastico' = fan-TAS-ti-co.
Use this after someone has made you genuinely laugh or after a conversation full of wit. In Italy, making people laugh is a highly respected social skill — this compliment acknowledges that skill and will delight the recipient.
'Senso dell'umorismo' is the Italian expression for sense of humour. 'Umorismo' comes from the English 'humour' (via French). The possessive 'dell'' (of the) creates the phrase. 'Fantastico' agrees with 'senso' (masculine).
Sei il tipo di persona che sa far ridere senza ferire.
You are the kind of person who can make people laugh without hurting.
Distinguishes kind humour from mean-spirited comedy
Ci vuole intelligenza per essere così divertente.
It takes intelligence to be this funny.
Connecting humour to intellectual capacity
La tua ironia è sopraffina.
Your irony is superb.
Italian comedic value — irony ('ironia') is deeply appreciated
Italian humour ('umorismo italiano') is rich and varied by region. Neapolitan humour ('umorismo napoletano') is famous for dark, absurdist wit. Milanese humour tends toward irony and understatement. Sicilian humour has bittersweet melancholy. All are characterised by expressive physicality, timing, and wordplay. 'Chi ride, vive' (he who laughs, lives) is a popular saying.