A made up word used by total dwankers who think that they are ordering a stylish beverage but have infact totally fucked-up the pronunciation. See espresso.
Preppie dwanker: "I'll have an expresso and my partner will have an expresso frappe latte strawberry with light cream and a twist of lime...cane sugar on the side."
Server: "What the fuck is an 'expresso?' And would you and your boyfriend like to serve your own sugar and cream over there by the pile of wood...this is an 'extreme getaway vacation' fruitloop; not Starbucks!"
The French version of an Italian "Espresso". Weaker, with more water. Often used mistakenly to describe the Italian version and is the target of arch wankers who like to express their superior "correctness".
How to correctly order such a coffee: "Un expresso s'il vous plaît"