When you go on a date during the course of which you give (or receive) a hand-job.
I went out with Thomo last night... later on when things got steamy it turned in to a spray date.
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Pronounced: tit-willy (TITWWLI).
Acronym: This Is The World We Live In
Meaning: Statement used to express incredulity at current events.
Dan: Dude, Donald Trump has been voted in as President!
Lynds: I know, titwilly!!