it means Boring

When you want to have a sexual relationship with someone but they're not willing to have it with you.

Welsh/UK slang

(adj): stupid, slow, 'not too bright'

not too bright

boring or not fun; used to describe a party

the opposite of "live"

Is the act of a straight male who is impressed by another man. Wether it is the other mans looks/persona achievements etc. The man concedes his respect to the other man.

Dull is an adjective. Dull has two meanings. (1) Boring
(2) Not sharp