Unattractive or difficult to be around [he's a real dick today].
A contemptible person.
diddle
n.
To do the sex act fuck.
Source: [1800's]
die for
colloq.
To have a strong desire for someone or something. [I would die for a good fuck.].
Source: [1980's]
die in the saddle
colloq.
Go to sleep while having anal intercourse.
Source: [late 1970s]
To die in the act of have sex.
diesel dyke
colloq.
An masculine, aggressive lesbian.
diet dirt
colloq.
Putting a gay man on a "diet," i.e., not sharing information with another gay person, either because he talks too much or is liable to get the information screwed up.
dig a ditch
colloq.
Anal intercourse.
dildoe
n.
An artificial substitute for an erect penis.
dildo
n.
An artificial substitute for an erect penis.
A vaguely-phallus-shaped device used for sexual gratification. Actually, they come in lots of shapes, from very-realistic penis-shape, to vegetables like corn cobs and zucchini, to dolphins [the non-representational ones are used by lesbians who don't care for phallic shapes].
Dilly-boy
colloq.
Male prostitute in the area of Picadilly Circus dipped: the acted of having gay sex.